qcacld-3.0: NULL pointer dereferenced when starting 11ax SAP

BSS Desc pointer will be NULL when starting SAP, in function
csr_roam_issue_start_bss(). And it is causing NULL pointer
dereference when get bss channel number from BSS Desc.

Get channel number from csr_roamstart_bssparams instead.

CRs-Fixed: 2272749
Change-Id: Idf4eeb21f1298db03a030af72bf9f0a530ba3e68
2 files changed