cfg80211: fix CAC_STARTED event handling

Exclude CAC_STARTED event from !wdev->cac_started check,
since cac_started will be set later in the same function.

Signed-off-by: Dmitry Lebed <dlebed@quantenna.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Change-Id: I7eb8f3e42221ae22e34b4edb06edcec7683eba33
Git-commit: 850964519a65a96aa8231ff31e28f30c2633484d
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


CRs-fixed: 2265562
Signed-off-by: Peng Xu <pxu@codeaurora.org>