* blur.c: fix the blur example’s argument checking.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2659 92316355-f0b4-4df1-b90c-862c8a59935f

examples/blur.c

@@ -12,7 +12,7 @@ int main(int argc, char *argv[])
     char *srcname = NULL, *dstname = NULL;
     pipi_image_t *img, *newimg;
 
-    if(argc < 3)
+    if(argc < 4)
     {
         fprintf(stderr, "%s: too few arguments\n", argv[0]);
         fprintf(stderr, "Usage: %s <src> <radius> <dest>\n", argv[0]);