avdevice/dshow: fix regression

a1c4929f accidentally undid part of d9a9b4c8, so the bug in ticket #9420
resurfaced. Fixing again.

Signed-off-by: Diederick Niehorster <dcnieho@gmail.com>
Reviewed-by: Roger Pack <rogerdpack2@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavdevice/dshow.c

@@ -1002,23 +1002,12 @@ dshow_cycle_formats(AVFormatContext *avctx, enum dshowDeviceType devtype,
                 );
                 continue;
             }
-            if (requested_sample_rate) {
-                if (requested_sample_rate > acaps->MaximumSampleFrequency ||
-                    requested_sample_rate < acaps->MinimumSampleFrequency)
-                    goto next;
-                fx->nSamplesPerSec = requested_sample_rate;
-            }
-            if (requested_sample_size) {
-                if (requested_sample_size > acaps->MaximumBitsPerSample ||
-                    requested_sample_size < acaps->MinimumBitsPerSample)
-                    goto next;
-                fx->wBitsPerSample = requested_sample_size;
-            }
-            if (requested_channels) {
-                if (requested_channels > acaps->MaximumChannels ||
-                    requested_channels < acaps->MinimumChannels)
-                    goto next;
-                fx->nChannels = requested_channels;
+            if (
+                (ctx->sample_rate && ctx->sample_rate != fx->nSamplesPerSec) ||
+                (ctx->sample_size && ctx->sample_size != fx->wBitsPerSample) ||
+                (ctx->channels    && ctx->channels    != fx->nChannels     )
+            ) {
+                goto next;
             }
         }