Fix event log test case

Changes:

       -  Fixed the testcase 'Verify Setting Error Log As Resolved'.

Tested:

       - Ran the testcase successfully from sandbox.

Change-Id: I9c6af16a23144082b061fbc4620f8eec94a7c855
Signed-off-by: Manash Sarma <manashsarma@in.ibm.com>
diff --git a/redfish/systems/eventlog/test_event_logging.robot b/redfish/systems/eventlog/test_event_logging.robot
index 5d18ffe..b1b4549 100644
--- a/redfish/systems/eventlog/test_event_logging.robot
+++ b/redfish/systems/eventlog/test_event_logging.robot
@@ -203,6 +203,7 @@
 
     # Mark error log as resolved by setting it to true.
     Redfish.Patch  ${EVENT_LOG_URI}Entries/${elog_entry[0]["Id"]}  body={'Resolved':True}
+    ...  valid_status_codes=[${HTTP_OK}, ${HTTP_NO_CONTENT}]
 
     ${elog_entry}=  Get Event Logs