Updated metric --xgmi_err to display string instead of object

Change-Id: I4f67384cdf65b5fa3cb04e1012ba79a53ae72cd7
Signed-off-by: Maisam Arif <maisarif@amd.com>

py-interface/amdsmi_interface.py

@@ -2393,7 +2393,7 @@ def amdsmi_gpu_xgmi_error_status(
             processor_handle, ctypes.byref(status))
     )
 
-    return AmdSmiXgmiStatus(status.value)
+    return AmdSmiXgmiStatus(status.value).value
 
 
 def amdsmi_reset_gpu_xgmi_error(