LU-2926 ldiskfs: crash in is_bad_inode() on SLES11 SP2

Fix error handling in ldiskfs_xattr_inode_iget
for SLES11 SP2 platform

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I05568cac5f4cc8a12cfd95034a99b06541289673
Reviewed-on: http://review.whamcloud.com/5709
Tested-by: Hudson
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>