qcacmn: Fix memory leak in rx_wbm_error_process

The nbuf is not freed for all possible branches in rx_wbm_error_pr
cess function. Add fix to ensure the nbuf free for all conditions.

CRs-Fixed: 2171899
Change-Id: I8e40fc7dc5afb0be0257244e1e704a0200ffacc0
1 file changed