[PATCH 1/2] xfs: Clear W=1 warning in xfs_iwalk_run_callbacks():

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For CONFIG_XFS_DEBUG unset, xfs_iwalk_run_callbacks() generates the
following warning for when building with W=1:

fs/xfs/xfs_iwalk.c: In function ‘xfs_iwalk_run_callbacks’:
fs/xfs/xfs_iwalk.c:354:42: error: variable ‘irec’ set but not used [-Werror=unused-but-set-variable]
  354 |         struct xfs_inobt_rec_incore     *irec;
      |                                          ^~~~
cc1: all warnings being treated as errors

Mark irec as __maybe_unused to clear the warning.

Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
 fs/xfs/xfs_iwalk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_iwalk.c b/fs/xfs/xfs_iwalk.c
index 01b55f03a102..a92030611ff4 100644
--- a/fs/xfs/xfs_iwalk.c
+++ b/fs/xfs/xfs_iwalk.c
@@ -351,7 +351,7 @@ xfs_iwalk_run_callbacks(
 	int				*has_more)
 	struct xfs_mount		*mp = iwag->mp;
-	struct xfs_inobt_rec_incore	*irec;
+	struct xfs_inobt_rec_incore __maybe_unused	*irec;
 	xfs_agino_t			next_agino;
 	int				error;

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