[SWDEV-543308] Fix xgmi_metrics_info initialization in xgmi

The xgmi_metrics_info variable was being referenced before
assignment when no destination GPUs were found or when the API
call failed. This caused an UnboundLocalError. Fixed this by
initializing xgmi_metrics_info with empty links structure.

Signed-off-by: Bindhiya Kanangot Balakrishnan <Bindhiya.KanangotBalakrishnan@amd.com>


[ROCm/amdsmi commit: f0453c2c75]

projects/amdsmi/amdsmi_cli/amdsmi_commands.py

@@ -6345,6 +6345,7 @@ class AMDSMICommands():
                     "link_type" : "N/A",
                     "links" : []
                 }
+                xgmi_metrics_info = {"links": []}
 
                 try:
                     xgmi_metrics_info = amdsmi_interface.amdsmi_get_link_metrics(src_gpu)