[PATCH] Fix error message in RemoveWalSummaryIfOlderThan to indicate file removal failure

[zengman]

Hi all,

I noticed a small issue. In `RemoveWalSummaryIfOlderThan`,an `unlink()` failure 
incorrectly logs "could not stat file", likely a copy-paste error.
I updated it to "could not remove file". No functional changes.

```
diff --git a/src/backend/backup/walsummary.c b/src/backend/backup/walsummary.c
index 21164faac7e..4ee510092f9 100644
--- a/src/backend/backup/walsummary.c
+++ b/src/backend/backup/walsummary.c
@@ -251,7 +251,7 @@ RemoveWalSummaryIfOlderThan(WalSummaryFile *ws, time_t 
cutoff_time)
        if (unlink(path) != 0)
                ereport(ERROR,
                                (errcode_for_file_access(),
-                                errmsg("could not stat file \"%s\": %m", 
path)));
+                                errmsg("could not remove file \"%s\": %m", 
path)));
        ereport(DEBUG2,
                        (errmsg_internal("removing file \"%s\"", path)));
 }
```

--
regards,
Man Zeng

0001-Fix-error-message-in-RemoveWalSummaryIfOlderThan-to-.patch
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