qcacmn: Fix wrong sta puncture bitmap issue

When wlan_reg_extract_puncture_by_bw return fail, new_punc isn't
filled, it is not initialized too, will be random value, it will
make F/W assert if the wrong puncture passed to F/W.

To fix it, initialize local var new_punc to 0.

Change-Id: I1554e1f55a2f5b319abc94b8409a5c4aed78e223
CRs-Fixed: 3506816

umac/mlme/connection_mgr/dispatcher/src/wlan_cm_api.c

@@ -414,7 +414,7 @@ QDF_STATUS wlan_cm_sta_set_chan_param(struct wlan_objmgr_vdev *vdev,
 	qdf_freq_t center_freq_320 = 0;
 	qdf_freq_t center_freq_40 = 0;
 	uint8_t band_mask;
-	uint16_t new_punc;
+	uint16_t new_punc = 0;
 
 	if (!vdev || !chan_param) {
 		mlme_err("invalid input parameters");