swscale-test: allocate more memory to prevent scalers from writing out of bounds

Some converters (ie. unscaled rgb24 -> argb) may write some bytes out of
bounds. Ideally the converters should be fixed, but in the meantime we allocate
more memory to prevent heap corruption.

Originally committed as revision 31768 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale-test.c

@@ -106,8 +106,10 @@ static int doTest(uint8_t *ref[4], int refStride[4], int w, int h,
          * prefer, as long as they're aligned enough for the architecture, and
          * they're freed appropriately (such as using av_free for buffers
          * allocated with av_malloc). */
-        src[i]= av_mallocz(srcStride[i]*srcH);
-        dst[i]= av_mallocz(dstStride[i]*dstH);
+        /* An extra 16 bytes is being allocated because some scalers may write
+         * out of bounds. */
+        src[i]= av_mallocz(srcStride[i]*srcH+16);
+        dst[i]= av_mallocz(dstStride[i]*dstH+16);
         out[i]= av_mallocz(refStride[i]*h);
         if (!src[i] || !dst[i] || !out[i]) {
             perror("Malloc");