rawdec: initialize return value to 0.

libavformat/rawdec.c

@@ -70,7 +70,7 @@ int ff_raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
             }
         case AVMEDIA_TYPE_VIDEO: {
             FFRawVideoDemuxerContext *s1 = s->priv_data;
-            int width = 0, height = 0, ret;
+            int width = 0, height = 0, ret = 0;
             enum PixelFormat pix_fmt;
 
             if(ap->time_base.num)