IPMI test code variable syntax error

Changes:
   - Variable '${initial_power_policy' was not closed properly.

Tested:
   - Sandbox test run

Change-Id: I31acade12bf2789dd262e87f7a4eb52413800eb7
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/ipmi/test_ipmi_chassis.robot b/ipmi/test_ipmi_chassis.robot
index f36468a..477be2a 100644
--- a/ipmi/test_ipmi_chassis.robot
+++ b/ipmi/test_ipmi_chassis.robot
@@ -97,7 +97,7 @@
     [Tags]  Verify_Chassis_Power_Policy
     [Setup]  Test Setup Execution
     [Teardown]  Run Keywords  FFDC On Test Case Fail  AND
-    ...  Run External IPMI Standard Command  chassis policy ${initial_power_policy
+    ...  Run External IPMI Standard Command  chassis policy ${initial_power_policy}
     [Template]  Set Chassis Power Policy Via IPMI And Verify
 
     # power_policy