LU-14780 llite: failed ASSERTION(ldlm_has_layout(lock))

LU-14780 llite: failed ASSERTION(ldlm_has_layout(lock))

When setting layout in layout lock, the lock could lost its layout
bits, and we'd try fetch the layout lock again.

Lustre-change: https://review.whamcloud.com/44054
Lustre-commit: 1b166d6dd6a2f39dfe35b60be169b288665d0283

Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I10f96e4cb03cfe228d3c1ea1500b1a8d8e4e5e54
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Yingjin Qian <qian@ddn.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>