Remove redundant cast in gindesc.c

[zengman]

Hi all,

While reviewing the code, I noticed a small detail and made this simple patch.
There are no functional changes; it??s just meant to make the code look a bit 
cleaner.

```
diff --git a/src/backend/access/rmgrdesc/gindesc.c 
b/src/backend/access/rmgrdesc/gindesc.c
index 66a0bf0e0e7..4e24a1cdfe7 100644
--- a/src/backend/access/rmgrdesc/gindesc.c
+++ b/src/backend/access/rmgrdesc/gindesc.c
@@ -126,7 +126,7 @@ gin_desc(StringInfo buf, XLogReaderState *record)
                                ginxlogSplit *xlrec = (ginxlogSplit *) rec;
 
                                appendStringInfo(buf, "isrootsplit: %c",
-                                                                
(((ginxlogSplit *) rec)->flags & GIN_SPLIT_ROOT) ? 'T' : 'F');
+                                                                (xlrec->flags 
& GIN_SPLIT_ROOT) ? 'T' : 'F');
                                appendStringInfo(buf, " isdata: %c isleaf: %c",
                                                                 (xlrec->flags 
& GIN_INSERT_ISDATA) ? 'T' : 'F',
                                                                 (xlrec->flags 
& GIN_INSERT_ISLEAF) ? 'T' : 'F');
```

--
regards,
Man Zeng

0001-Remove-redundant-cast-in-gindesc.c.patch
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