Use intptr_t when playing with void*s

svn:r1795

src/or/test.c

@@ -501,7 +501,7 @@ static void* _squareAndRemoveK4(const char *key, void*val, void *data)
     ++(*ip);
     return NULL;
   }
-  v = (int)val;
+  v = (intptr_t)val;
   return (void*)(v*v);
 }