mem-ruby: fix CHI sending the wrong snoop response

Do not respond with SnpRespData_I when the line is still present
upstream.

Change-Id: I2592e5c6637cfc0e83042169a245837648276e61
Signed-off-by: Tiago Mück <tiago.muck@arm.com>

src/mem/ruby/protocol/chi/CHI-cache-actions.sm

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2022 ARM Limited
+ * Copyright (c) 2021-2023 ARM Limited
  * All rights reserved
  *
  * The license below extends only to copyright in the software and shall
@@ -2316,7 +2316,7 @@ action(Send_SnpRespData, desc="") {
          ((tbe.dataDirty || tbe.dataUnique) && (tbe.reqType == CHIRequestType:SnpShared)) ||
          ((tbe.dataDirty || tbe.dataUnique) && (tbe.reqType == CHIRequestType:SnpUnique)));
 
-  if (tbe.dataToBeInvalid) {
+  if (tbe.dataToBeInvalid && tbe.dir_sharers.isEmpty()) {
     assert(tbe.dataMaybeDirtyUpstream == false);
     if (tbe.dataDirty) {
       tbe.snd_msgType := CHIDataType:SnpRespData_I_PD;