swscale-example: Don't return random value from main().

git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@29504 b3059339-0415-0410-9bf9-f77b7e298cf2

swscale-example.c

@@ -233,5 +233,5 @@ int main(int argc, char **argv){
 
     selfTest(src, stride, W, H);
 
-    return 123;
+    return 0;
 }