ck_epoch: Fix typo (affects RMO targets).

Author: Samy Al Bahra

src/ck_epoch.c

@@ -202,7 +202,7 @@ _ck_epoch_addref(struct ck_epoch_record *record,
 		 */
 		previous = &record->local.bucket[(i + 1) & CK_EPOCH_SENSE];
 		if (previous->count > 0)
-			ck_pr_fence_acq_rel();
+			ck_pr_fence_acqrel();
 #endif /* !CK_MD_TSO */
 
 		/*