qcacmn: Initialize the struct variable

Initialize the cancel_scan_event variable used
in ucfg_scan_cancel_sync().

Change-Id: I120b14db6f31449136b74b28d452e029eace16cd
CRs-Fixed: 2313447

umac/scan/dispatcher/src/wlan_scan_ucfg_api.c

@@ -1145,6 +1145,7 @@ ucfg_scan_cancel_sync(struct scan_cancel_request *req)
 		return status;
 	}
 
+	memset(&cancel_scan_event, 0, sizeof(cancel_scan_event));
 	/*
 	 * If cancel req is to cancel all scan of pdev or vdev
 	 * wait until all scan of pdev or vdev get cancelled