Replace (GUC_UNIT_MEMORY | GUC_UNIT_TIME) with GUC_UNIT in guc.c

Hi, hackers

We use (GUC_UNIT_MEMORY | GUC_UNIT_TIME) instead of GUC_UNIT even though we
already define it in guc.h.

Maybe using GUC_UNIT is better?  Here is a patch to fix it.

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a9033b7a54..5308896c87 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -2766,7 +2766,7 @@ convert_real_from_base_unit(double base_value, int base_unit,
 const char *
 get_config_unit_name(int flags)
 {
-    switch (flags & (GUC_UNIT_MEMORY | GUC_UNIT_TIME))
+    switch (flags & GUC_UNIT)
     {
         case 0:
             return NULL;        /* GUC has no units */
@@ -2802,7 +2802,7 @@ get_config_unit_name(int flags)
             return "min";
         default:
             elog(ERROR, "unrecognized GUC units value: %d",
-                 flags & (GUC_UNIT_MEMORY | GUC_UNIT_TIME));
+                 flags & GUC_UNIT);
             return NULL;
     }
 }
 
-- 
Regrads,
Japin Li.