LU-4199 llite: Init lli_lmv_md field of struct ll_inode_info

LU-4199 llite: Init lli_lmv_md field of struct ll_inode_info

lli_lmv_md field of structure ll_inode_info is not inited to NULL,
which causes lmv_read_entry() to crash the kernel when trying to
access it.

Signed-off-by: Li Xi <lixi@ddn.com>
Change-Id: I84e932a4246b4637d5ba240ea9193c8b347d62e4
Reviewed-on: http://review.whamcloud.com/9042
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>