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Avoid integer overflow in Mosaic maximum-size check

--- a/mosaic.c

+++ b/mosaic.c

@@ -241,7 +241,7 @@

     if (params->height < 3 || params->width < 3) {

         return "Minimal size is 3x3";

     }

-    if (params->height * params->width > MAX_TILES) {

+    if (params->height > MAX_TILES / params->width) {

         return MAX_TILES_ERROR;

     }

     return NULL;