LU-12904 o2ib: ib_destroy_cq() returns void

LU-12904 o2ib: ib_destroy_cq() returns void

Kernel destroy CQ flows can't fail and the returned value of
ib_destroy_cq() is not interested in those flows.

kernel-commit: 890ac8d97e6722a9e4a66a0bd836d1b028d075fe

This patch is back-ported from the following one:
Lustre-commit: 7d2ea1e5bbd80f23e6935174c969b34b58048443
Lustre-change: https://review.whamcloud.com/36578

Test-Parameters: trivial
Cray-bug-id: LUS-8042
Signed-off-by: Shaun Tancheff <stancheff@cray.com>
Change-Id: I873bf76a33bd80d5e6de4d1b16a79ff5ea930f3a
Reviewed-on: https://review.whamcloud.com/38489
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>