ff_msmpeg4_decode_init() calls ff_h263_decode_init() which calls

MPV_common_init(), so calling both is redundant and leads to memory
leaks in WMV3/VC-1 decoder. Thus use only the first function in
WMV3/VC-1 decoder initialization.

Originally committed as revision 22024 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vc1dec.c

@@ -2994,11 +2994,9 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
         avctx->idct_algo=FF_IDCT_WMV2;
     }
 
-    if(ff_h263_decode_init(avctx) < 0)
+    if(ff_msmpeg4_decode_init(avctx) < 0)
         return -1;
     if (vc1_init_common(v) < 0) return -1;
-    // only for ff_msmp4_mb_i_table
-    if (ff_msmpeg4_decode_init(avctx) < 0) return -1;
 
     avctx->coded_width = avctx->width;
     avctx->coded_height = avctx->height;