FATE: fix colorbalance fate test failed on x86_32

floating point precision will cause rgb*max generate different value on
x86_32 and x86_64. have pass fate test on x86_32 and x86_64 by using
lrintf to get the nearest integral value for rgb * max before av_clip.

Reviewed-by:   Paul B Mahol <onemda@gmail.com>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

libavfilter/vf_colorbalance.c

@@ -188,9 +188,9 @@ static int color_balance8_p(AVFilterContext *ctx, void *arg, int jobnr, int nb_j
             if (s->preserve_lightness)
                 preservel(&r, &g, &b, l);
 
-            dstr[j] = av_clip_uint8(r * max);
-            dstg[j] = av_clip_uint8(g * max);
-            dstb[j] = av_clip_uint8(b * max);
+            dstr[j] = av_clip_uint8(lrintf(r * max));
+            dstg[j] = av_clip_uint8(lrintf(g * max));
+            dstb[j] = av_clip_uint8(lrintf(b * max));
             if (in != out && out->linesize[3])
                 dsta[j] = srca[j];
         }
@@ -242,9 +242,9 @@ static int color_balance16_p(AVFilterContext *ctx, void *arg, int jobnr, int nb_
             if (s->preserve_lightness)
                 preservel(&r, &g, &b, l);
 
-            dstr[j] = av_clip_uintp2_c(r * max, depth);
-            dstg[j] = av_clip_uintp2_c(g * max, depth);
-            dstb[j] = av_clip_uintp2_c(b * max, depth);
+            dstr[j] = av_clip_uintp2_c(lrintf(r * max), depth);
+            dstg[j] = av_clip_uintp2_c(lrintf(g * max), depth);
+            dstb[j] = av_clip_uintp2_c(lrintf(b * max), depth);
             if (in != out && out->linesize[3])
                 dsta[j] = srca[j];
         }
@@ -299,9 +299,9 @@ static int color_balance8(AVFilterContext *ctx, void *arg, int jobnr, int nb_job
             if (s->preserve_lightness)
                 preservel(&r, &g, &b, l);
 
-            dst[j + roffset] = av_clip_uint8(r * max);
-            dst[j + goffset] = av_clip_uint8(g * max);
-            dst[j + boffset] = av_clip_uint8(b * max);
+            dst[j + roffset] = av_clip_uint8(lrintf(r * max));
+            dst[j + goffset] = av_clip_uint8(lrintf(g * max));
+            dst[j + boffset] = av_clip_uint8(lrintf(b * max));
             if (in != out && step == 4)
                 dst[j + aoffset] = src[j + aoffset];
         }
@@ -351,9 +351,9 @@ static int color_balance16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jo
             if (s->preserve_lightness)
                 preservel(&r, &g, &b, l);
 
-            dst[j + roffset] = av_clip_uintp2_c(r * max, depth);
-            dst[j + goffset] = av_clip_uintp2_c(g * max, depth);
-            dst[j + boffset] = av_clip_uintp2_c(b * max, depth);
+            dst[j + roffset] = av_clip_uintp2_c(lrintf(r * max), depth);
+            dst[j + goffset] = av_clip_uintp2_c(lrintf(g * max), depth);
+            dst[j + boffset] = av_clip_uintp2_c(lrintf(b * max), depth);
             if (in != out && step == 4)
                 dst[j + aoffset] = src[j + aoffset];
         }

tests/ref/fate/filter-colorbalance

@@ -3,6 +3,6 @@
 #codec_id 0: rawvideo
 #dimensions 0: 352x288
 #sar 0: 0/1
-0,          0,          0,        1,   304128, 0xd50c9fea
-0,          1,          1,        1,   304128, 0xdf9e1f79
-0,          2,          2,        1,   304128, 0x9b84087e
+0,          0,          0,        1,   304128, 0xf68fadfd
+0,          1,          1,        1,   304128, 0xa6302d9a
+0,          2,          2,        1,   304128, 0x758d165a

tests/ref/fate/filter-colorbalance-gbrap

@@ -3,6 +3,6 @@
 #codec_id 0: rawvideo
 #dimensions 0: 352x288
 #sar 0: 0/1
-0,          0,          0,        1,   405504, 0xd33217e5
-0,          1,          1,        1,   405504, 0x08f161af
-0,          2,          2,        1,   405504, 0x27508654
+0,          0,          0,        1,   405504, 0xdcc71df0
+0,          1,          1,        1,   405504, 0x48d56675
+0,          2,          2,        1,   405504, 0x68058bf0

tests/ref/fate/filter-colorbalance-gbrap-16

@@ -3,6 +3,6 @@
 #codec_id 0: rawvideo
 #dimensions 0: 352x288
 #sar 0: 0/1
-0,          0,          0,        1,   405504, 0x2e44c4b0
-0,          1,          1,        1,   405504, 0xf47244e0
-0,          2,          2,        1,   405504, 0x040769dd
+0,          0,          0,        1,   405504, 0xa497ca1b
+0,          1,          1,        1,   405504, 0x92c24b0e
+0,          2,          2,        1,   405504, 0x965270bd

tests/ref/fate/filter-colorbalance-rgba64

@@ -3,6 +3,6 @@
 #codec_id 0: rawvideo
 #dimensions 0: 352x288
 #sar 0: 0/1
-0,          0,          0,        1,   811008, 0x42e5db8b
-0,          1,          1,        1,   811008, 0x31be5974
-0,          2,          2,        1,   811008, 0xdef21287
+0,          0,          0,        1,   811008, 0xc5f7e6ba
+0,          1,          1,        1,   811008, 0x266955bf
+0,          2,          2,        1,   811008, 0x55360c6e