Fix xpath for logout button.

Resolves openbmc/openbmc-test-automation#1405

Change-Id: Ibd148a8c40aa387d984bb31551d7f442675fdcd9
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
diff --git a/gui/obmc_gui/lib/resource.robot b/gui/obmc_gui/lib/resource.robot
index 52717cf..9ed6c32 100644
--- a/gui/obmc_gui/lib/resource.robot
+++ b/gui/obmc_gui/lib/resource.robot
@@ -194,7 +194,7 @@
     [Documentation]  Log out of OpenBMC GUI.
     SSHLibrary.Close All Connections
     # Passing direct id element "header" as an argument to Click Element.
-    Click Element  header
+    Click Element  ${xpath_button_logout}
     Wait Until Page Contains Element  ${xpath_button_login}
 
 Test Teardown Execution