code refine (#6164)

Author: chengduo

paddle/platform/enforce.h

@@ -244,7 +244,7 @@ inline void throw_on_error(T e) {
 
 #define __PADDLE_BINARY_COMPARE(__VAL0, __VAL1, __CMP, __INV_CMP, ...)  \
   do {                                                                  \
-    if (!UNLIKELY((__VAL0)__CMP(__VAL1))) {                             \
+    if (UNLIKELY(!((__VAL0)__CMP(__VAL1)))) {                           \
       PADDLE_THROW("enforce %s " #__CMP " %s failed, %s " #__INV_CMP    \
                    " %s\n%s",                                           \
                    #__VAL0, #__VAL1, paddle::string::to_string(__VAL0), \