qcacmn: Initialize ret in send_pdev_utf_cmd_tlv

If param->len was 0, ret would be returned without being initialized.
param->len of 0 is unexpected, so return an error.

Change-Id: Ib9b0a60976dedcf8fcd4184083a9948892791621
CRs-Fixed: 1072077
diff --git a/wmi_unified.c b/wmi_unified.c
index 55c814b..1c65b5a 100644
--- a/wmi_unified.c
+++ b/wmi_unified.c
@@ -1719,8 +1719,8 @@
  *
  * Return: 0 on success
  */
-int wmi_unified_cmd_send(wmi_unified_t wmi_handle, wmi_buf_t buf, uint32_t len,
-			 uint32_t cmd_id)
+QDF_STATUS wmi_unified_cmd_send(wmi_unified_t wmi_handle, wmi_buf_t buf,
+				uint32_t len, uint32_t cmd_id)
 {
 	HTC_PACKET *pkt;
 	A_STATUS status;
@@ -1739,7 +1739,7 @@
 	if (wmi_handle->wmi_stopinprogress) {
 		QDF_TRACE(QDF_MODULE_ID_WMI, QDF_TRACE_LEVEL_ERROR,
 			"WMI  stop in progress\n");
-		return -EINVAL;
+		return QDF_STATUS_E_INVAL;
 	}
 
 #ifndef WMI_NON_TLV_SUPPORT