qcacmn: Fix invalid memory free

Problem:
Memory is allocated for avoid_freq_ind in reg_call_chan_change_cbks
function and freed when avoid_freq_ind is NULL.

Solution:
Memory is freed when avoid_freq_ind is not NULL.

Change-Id: I263441c5b05755054ee581b20af191d93c3dea5e
CRs-Fixed: 2124580

umac/regulatory/core/src/reg_services.c

@@ -2210,7 +2210,7 @@ skip_ch_avoid_ind:
 					cbk_list[ctr].arg);
 	}
 	qdf_mem_free(cur_chan_list);
-	if (!avoid_freq_ind)
+	if (avoid_freq_ind)
 		qdf_mem_free(avoid_freq_ind);
 }