Avoid crash on planarCopy to a destination without alpha.

Makes regression tests run again, though the results are still wrong.


git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@29018 b3059339-0415-0410-9bf9-f77b7e298cf2

swscale.c

@@ -2117,7 +2117,8 @@ static int planarCopy(SwsContext *c, uint8_t* src[], int srcStride[], int srcSli
         int y=      (plane==0 || plane==3) ? srcSliceY: -((-srcSliceY)>>c->chrDstVSubSample);
         int height= (plane==0 || plane==3) ? srcSliceH: -((-srcSliceH)>>c->chrDstVSubSample);
 
-        if (dst[plane] && !src[plane])
+        if (!dst[plane]) continue;
+        if (!src[plane])
             fillPlane(dst[plane], dstStride[plane], length, height, y, (plane==3) ? 255 : 128);
         else
         {