Silence GCC warnings:

ibswscale/swscale.c: In function ‘sws_scale’:
libswscale/swscale.c:2678: warning: ‘b’ may be used uninitialized in
this function
libswscale/swscale.c:2678: warning: ‘g’ may be used uninitialized in
this function
libswscale/swscale.c:2678: warning: ‘r’ may be used uninitialized in
this function

Originally committed as revision 27837 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale.c

@@ -2734,7 +2734,8 @@ int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
                 r= (i>>3    )*255;
                 g= ((i>>1)&3)*85;
                 b= (i&1     )*255;
-            }else if(c->srcFormat == PIX_FMT_BGR4_BYTE){
+            }else {
+                assert(c->srcFormat == PIX_FMT_BGR4_BYTE);
                 b= (i>>3    )*255;
                 g= ((i>>1)&3)*85;
                 r= (i&1     )*255;