Silence uninitialized-variable warning.

Quite a few buildfarm animals are warning about this, and lapwing
is actually failing (because -Werror).  It's a false positive AFAICS,
so no need to do more than zero the variable to start with.

Discussion: https://postgr.es/m/YYXJnUxgw9dZKxlX@paquier.xyz

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 7b1b3e802bb7b8222e75ad3ff318ceab4fa5bc9b..5cda30836f8f8edc862750ea03565e855ce23667 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -12109,6 +12109,9 @@ read_backup_label(XLogRecPtr *checkPointLoc, TimeLineID *backupLabelTLI,
        uint32          hi,
                                lo;
 
+       /* suppress possible uninitialized-variable warnings */
+       *checkPointLoc = InvalidXLogRecPtr;
+       *backupLabelTLI = 0;
        *backupEndRequired = false;
        *backupFromStandby = false;