qcacmn: Fix for crash during unload of driver modules

Change ce_cancel API to return error status in srng implementation.
Since this feature is not yet added, it should return error status, zero
or success return value will result in a infinite loop causing access to
invalid memory.

Change-Id: I871cc16e2854aeca694c7538cc1e99ab24b04de6
CRs-Fixed: 1097695

hif/src/ce/ce_service_srng.c

@@ -535,7 +535,7 @@ ce_cancel_send_next_srng(struct CE_handle *copyeng,
 		unsigned int *transfer_idp,
 		uint32_t *toeplitz_hash_result)
 {
-	return 0;
+	return QDF_STATUS_E_INVAL;
 }
 
 /* Shift bits to convert IS_*_RING_*_WATERMARK_MASK to CE_WM_FLAG_*_* */