avcodec/mss2: Provide non NULL context to av_log()

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/mss2.c

@@ -174,7 +174,7 @@ static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
     return 1 + ncol * 3;
 }
 
-static int decode_555(GetByteContext *gB, uint16_t *dst, ptrdiff_t stride,
+static int decode_555(AVCodecContext *avctx, GetByteContext *gB, uint16_t *dst, ptrdiff_t stride,
                       int keyframe, int w, int h)
 {
     int last_symbol = 0, repeat = 0, prev_avail = 0;
@@ -212,7 +212,7 @@ static int decode_555(GetByteContext *gB, uint16_t *dst, ptrdiff_t stride,
                     repeat = 0;
                     while (b-- > 130) {
                         if (repeat >= (INT_MAX >> 8) - 1) {
-                            av_log(NULL, AV_LOG_ERROR, "repeat overflow\n");
+                            av_log(avctx, AV_LOG_ERROR, "repeat overflow\n");
                             return AVERROR_INVALIDDATA;
                         }
                         repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
@@ -634,7 +634,7 @@ static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     if (is_555) {
         bytestream2_init(&gB, buf, buf_size);
 
-        if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
+        if (decode_555(avctx, &gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
                        keyframe, avctx->width, avctx->height))
             return AVERROR_INVALIDDATA;