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.

diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 10b3b090535192f692eb13c6c8f5aaa340707a10..3d2c9c3e8cf529279e0c6e40949b331a1ae7a346 100644 (file)
--- 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;