qcacld-3.0: Validate adapter before sched scan stop

wlan_hdd_cfg80211_sched_scan_stop() currently does not validate the
given adapter or the hdd context. Validate both before performing a
scheduled scan stop operation on said adapter.

Change-Id: I4e0370ad059fbb0371a38300f33dfae7a9f8106d
CRs-Fixed: 2289411
1 file changed