RDMA/uverbs: Initialize cq_context appropriately

RDMA/uverbs: Initialize cq_context appropriately

Initializing cq_context with ev_queue in create_cq(), leads to NULL pointer
dereference in ib_uverbs_comp_handler(), if application doesnot use completion
channel. This patch fixes the cq_context initialization.

Fixes: 1e7710f3f65 ("IB/core: Change completion channel to use the reworked")
Cc: [email protected] # 4.12
Signed-off-by: Potnuri Bharat Teja <[email protected]>
Reviewed-by: Matan Barak <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>
(cherry picked from commit 699a2d5b1b880b4e4e1c7d55fa25659322cf5b51)