qcacmn: Fix KW issues

Potential NULL pointer dereferences of wmi_handle are found in these
functions:
wmi_extract_dfs_cac_complete_event()
wmi_extract_dfs_radar_detection_event()
wmi_extract_reg_chan_list_update_event()
wmi_extract_reg_11d_new_cc_event()
wmi_extract_reg_ch_avoid_event()

Introduce wmi_handle NULL check in the above functions.

Change-Id: I30a842818dff400b8648293f65794ff382eb24e7
CRs-Fixed: 2286258
2 files changed