xfs: remove usage of is_bad_inode

XFS never calls mark_inode_bad or iget_failed, so it will never see a
bad inode. Remove all checks for is_bad_inode because they are
unnecessary.

Signed-off-by: Ben Myers <[e-mail]>
Reviewed-by: Dave Chinner <[e-mail]>

fs/xfs/xfs_icache.c

···
 	if (!igrab(inode))
 		return ENOENT;
 
-	if (is_bad_inode(inode)) {
-		IRELE(ip);
-		return ENOENT;
-	}
-
 	/* inode is valid */
 	return 0;
 
···
 		xfs_iflock(ip);
 	}
 
-	if (is_bad_inode(VFS_I(ip)))
-		goto reclaim;
 	if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
 		xfs_iunpin_wait(ip);
 		xfs_iflush_abort(ip, false);

fs/xfs/xfs_inode.c

···
 	 * If the inode is already free, then there can be nothing
 	 * to clean up here.
 	 */
-	if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
+	if (ip->i_d.di_mode == 0) {
 		ASSERT(ip->i_df.if_real_bytes == 0);
 		ASSERT(ip->i_df.if_broot_bytes == 0);
 		return VN_INACTIVE_CACHE;

fs/xfs/xfs_super.c

···
 
 	XFS_STATS_INC(vn_reclaim);
 
-	/* bad inode, get out here ASAP */
-	if (is_bad_inode(inode))
-		goto out_reclaim;
-
 	ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
 
 	/*
···
 	 * this more efficiently than we can here, so simply let background
 	 * reclaim tear down all inodes.
 	 */
-out_reclaim:
 	xfs_inode_set_reclaim_tag(ip);
 }
 
···
 	root = igrab(VFS_I(mp->m_rootip));
 	if (!root) {
 		error = ENOENT;
-		goto out_unmount;
-	}
-	if (is_bad_inode(root)) {
-		error = EINVAL;
 		goto out_unmount;
 	}
 	sb->s_root = d_make_root(root);