build: fix 32-bit test failure

Same fix as commit 1fc288e1.

* tests/hashtest.c (testHashRemoveForEach): Use correct format.

tests/hashtest.c

@@ -360,7 +360,7 @@ testHashForEach(const void *data ATTRIBUTE_UNUSED)
     if (count != ARRAY_CARDINALITY(uuids)) {
         if (virTestGetVerbose()) {
             testError("\nvirHashForEach didn't go through all entries,"
-                      " %d != %lu\n",
+                      " %d != %zu\n",
                       count, ARRAY_CARDINALITY(uuids));
         }
         goto cleanup;