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>

fs/xfs/scrub/common.c

@@ -711,7 +711,7 @@ xchk_get_inode(
 		return error;
 	}
 	if (VFS_I(ip)->i_generation != sc->sm->sm_gen) {
-		iput(VFS_I(ip));
+		xfs_irele(ip);
 		return -ENOENT;
 	}