This commit fixes a bug, where we could assign a CQ depth
of zero, leading to a subsequent divide-by-zero fault.
It also fixes an issue where the original default CQ depth
was returned on a query, instead of the overridden value.
Fixes: 86fe66d456 ("event/dlb2: allow CQ depths up to 1024")
Cc: stable@dpdk.org
Signed-off-by: Timothy McDaniel <timothy.mcdaniel@intel.com>