Fix a typo that causes an assertion to always fail.

Reported by Alexander Bokovikov (openworld AT uralweb DOT ru)

Originally committed as revision 26257 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale.c

@@ -2395,7 +2395,7 @@ SwsContext *sws_getContext(int srcW, int srcH, int srcFormat, int dstW, int dstH
     //try to avoid drawing green stuff between the right end and the stride end
     for (i=0; i<c->vChrBufSize; i++) memset(c->chrPixBuf[i], 64, (VOF+1)*2);
 
-    assert(2*VOF == VOFW);
+    assert(2*VOFW == VOF);
 
     ASSERT(c->chrDstH <= dstH)