From 47f514dd9a0022a04d321b627b2e991cb85396e2 Mon Sep 17 00:00:00 2001
From: Michael Paquier <michael@paquier.xyz>
Date: Tue, 29 Jun 2021 11:54:11 +0900
Subject: [PATCH] Fix compilation warning in xloginsert.c

This is reproducible with gcc using at least -O0.  The last checks
validating the compression of a block could not be reached with this
variable not set, but let's be clean.

Oversight in 4035cd5, per buildfarm member lapwing.
---
 src/backend/access/transam/xloginsert.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 10b3b090535..3d2c9c3e8cf 100644
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -863,7 +863,7 @@ XLogCompressBackupBlock(char *page, uint16 hole_offset, uint16 hole_length,
 						char *dest, uint16 *dlen)
 {
 	int32		orig_len = BLCKSZ - hole_length;
-	int32		len;
+	int32		len = -1;
 	int32		extra_bytes = 0;
 	char	   *source;
 	PGAlignedBlock tmp;