qcacmn: Fix NULL pointer dereference

In extract_hal_reg_cap_tlv(), hal_reg_capabilities
can be optionally defined. This field can be NULL
resulting in a NULL pointer read. Add NULL pointer
check before qdf_memory_call().

Change-Id: I142bed65e80aa9b4bb88a4e68f74235dd50e3624
CRs-Fixed: 2368284
1 file changed