qcacmn: fix error in NULL checking of rx_ring_history

rx_ring_history is an array of pointers, address of pointer is
always a non-NULL value, this always passed the NULL check,
which leads to NULL pointer dereference, fixing the same.

Change-Id: I401203a6f2a5930869cf4002ac0e714d3fdba62f
CRs-Fixed: 2844038