Restructure if() in check_mv()

quite a bit faster

Originally committed as revision 21504 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264_loopfilter.c

@@ -430,12 +430,14 @@ static int check_mv(H264Context *h, long b_idx, long bn_idx, int mvy_limit){
     v = h->ref_cache[0][b_idx] != h->ref_cache[0][bn_idx] |
         h->mv_cache[0][b_idx][0] - h->mv_cache[0][bn_idx][0] + 3 >= 7U |
         FFABS( h->mv_cache[0][b_idx][1] - h->mv_cache[0][bn_idx][1] ) >= mvy_limit;
-    if(h->list_count==2 && !v)
+
+    if(h->list_count==2){
+        if(!v)
         v = h->ref_cache[1][b_idx] != h->ref_cache[1][bn_idx] |
             h->mv_cache[1][b_idx][0] - h->mv_cache[1][bn_idx][0] + 3 >= 7U |
             FFABS( h->mv_cache[1][b_idx][1] - h->mv_cache[1][bn_idx][1] ) >= mvy_limit;
 
-    if(h->list_count==2 && v){
+    if(v){
         if(h->ref_cache[0][b_idx] != h->ref_cache[1][bn_idx] |
            h->mv_cache[0][b_idx][0] - h->mv_cache[1][bn_idx][0] + 3 >= 7U |
            FFABS( h->mv_cache[0][b_idx][1] - h->mv_cache[1][bn_idx][1] ) >= mvy_limit)
@@ -446,6 +448,7 @@ static int check_mv(H264Context *h, long b_idx, long bn_idx, int mvy_limit){
             return 1;
         return 0;
     }
+    }
 
     return v;
 }