Suppress maybe-uninitialized warning.

Following commit e035863c9a0, building with -O0 began triggering
warnings about potentially uninitialized 'workbuf' usage. While
theoretically the initialization isn't necessary since VARDATA()
doesn't access the contents of the pointed-to object, this commit
explicitly initializes the workbuf variable to suppress the warning.

Buildfarm members adder and flaviventris have shown the warning.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAD21AoCOZxfqnNgfM5yVKJZYnOq5m2Q96fBGy1fovEqQ9V4OZA@mail.gmail.com

diff --git a/src/backend/storage/large_object/inv_api.c b/src/backend/storage/large_object/inv_api.c
index 68b76f2cc18a08c69fcf5a80071f16ccb931292a..a874000c8ca26bb78e6fd8071226374ce7b77101 100644 (file)
--- a/src/backend/storage/large_object/inv_api.c
+++ b/src/backend/storage/large_object/inv_api.c
@@ -561,7 +561,7 @@ inv_write(LargeObjectDesc *obj_desc, const char *buf, int nbytes)
        char        data[LOBLKSIZE + VARHDRSZ];
        /* ensure union is aligned well enough: */
        int32       align_it;
-   }           workbuf;
+   }           workbuf = {0};
    char       *workb = VARDATA(&workbuf.hdr);
    HeapTuple   newtup;
    Datum       values[Natts_pg_largeobject];
@@ -752,7 +752,7 @@ inv_truncate(LargeObjectDesc *obj_desc, int64 len)
        char        data[LOBLKSIZE + VARHDRSZ];
        /* ensure union is aligned well enough: */
        int32       align_it;
-   }           workbuf;
+   }           workbuf = {0};
    char       *workb = VARDATA(&workbuf.hdr);
    HeapTuple   newtup;
    Datum       values[Natts_pg_largeobject];