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 <bpm@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index e3d7538..5ac716b 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1687,7 +1687,7 @@
 	 * 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;