xfs: clean up IRELE/iput callsites

Replace the IRELE macro with a proper function so that we can do proper
typechecking and so that we can stop open-coding iput in scrub, which
means that we'll be able to ftrace inode lifetimes going through scrub
correctly.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
diff --git a/fs/xfs/xfs_export.c b/fs/xfs/xfs_export.c
index 3cf4682..f2284ce 100644
--- a/fs/xfs/xfs_export.c
+++ b/fs/xfs/xfs_export.c
@@ -150,7 +150,7 @@ xfs_nfs_get_inode(
 	}
 
 	if (VFS_I(ip)->i_generation != generation) {
-		IRELE(ip);
+		xfs_irele(ip);
 		return ERR_PTR(-ESTALE);
 	}