mem-ruby: removed check for WriteCleanFull

Relaxed check on Send_WriteCleanFull. That data state may actually
happen if the writeback was triggered by a CleanUnique request.

JIRA: https://gem5.atlassian.net/browse/GEM5-1195

Change-Id: I33ec5693df09efe39345f403c5b6d3388f1a5056
Signed-off-by: Tiago Mück <tiago.muck@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/57390
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Daecheol You <daecheol.you@samsung.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/mem/ruby/protocol/chi/CHI-cache-actions.sm b/src/mem/ruby/protocol/chi/CHI-cache-actions.sm
index 7dbb05c..6c87416 100644
--- a/src/mem/ruby/protocol/chi/CHI-cache-actions.sm
+++ b/src/mem/ruby/protocol/chi/CHI-cache-actions.sm
@@ -1298,7 +1298,6 @@
   assert(tbe.dataValid);
   assert(is_HN == false);
   assert(tbe.dataDirty);
-  assert(tbe.dataMaybeDirtyUpstream == false);
 
   enqueue(reqOutPort, CHIRequestMsg, request_latency) {
     prepareRequest(tbe, CHIRequestType:WriteCleanFull, out_msg);