drm/xe/client: Check return value of xe_force_wake_get

xe_force_wake_get() can return error so check it's return value
before reading gpu_timestamp value.

v2: set HWE to NULL instead of setting timestamp to 0(Lucas)
    Add a warn on for xe_force_wake_put(Himal)

Fixes: 188ced1e ("drm/xe/client: Print runtime to fdinfo")
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240625094228.5327-1-nirmoy.das@intel.comSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/xe/xe_drm_client.c

@@ -264,9 +264,13 @@ static void show_run_ticks(struct drm_printer *p, struct drm_file *file)
 		if (!hwe)
 			continue;
 
-		xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+		if (xe_force_wake_get(gt_to_fw(gt), XE_FW_GT)) {
+			hwe = NULL;
+			break;
+		}
+
 		gpu_timestamp = xe_hw_engine_read_timestamp(hwe);
-		xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
+		XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FW_GT));
 		break;
 	}