examples: Add missing free()

Signed-off-by: Martin Belanger <[email protected]>

Author: Martin Belanger

examples/discover-loop.c

@@ -87,5 +87,6 @@ int main()
 		print_discover_log(log);
 
 	nvme_free_tree(r);
+	free(log);
 	return 0;
 }