staging/lustre/llite: fix open lock matching in ll_md_blocking_ast()

In ll_md_blocking_ast() match open locks before all others, ensuring
that MDS_INODELOCK_OPEN is not cleared from bits by another open lock
with a different mode. Change the int flags parameter of
ll_md_real_close() to fmode_t fmode. Clean up verious style issues in
both functions.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Reviewed-on: http://review.whamcloud.com/8718
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4429


Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>