7127  remove -Wno-missing-braces from Makefile.uts

@@ -38,11 +38,11 @@
 
 #include <sys/ksynch.h>
 
 typedef kmutex_t k5_mutex_t;
 
-#define K5_MUTEX_PARTIAL_INITIALIZER {0}
+#define K5_MUTEX_PARTIAL_INITIALIZER {{NULL}}
 
 /* ARGSUSED */
 static void k5_mutex_assert_locked(k5_mutex_t *m) { }
 
 static int