qcacld-3.0: Fix error handling cases in mac_open

Address remaining comments from I39eaa7bef5e5c50b9b1a8833bec5e6da8cdf0d72
to fix error handling cases in mac_open.

Change-Id: Ica67df97442275e80cb6a33da5b431ab457bb6ea
CRs-Fixed: 2305354
1 file changed