qcacld-3.0: Make sure NULL pm_ctx pointer not be accessed before initialization

Make sure NULL pm_ctx pointer not be accessed before initialization.
Before initialization, __policy_mgr_check_sta_ap_concurrent_ch_intf
return directly when meet error condition.

Change-Id: I4a96ca7c18d7c524969b8ea95d3bc717cfb0862c
CRs-Fixed: 2642567
1 file changed