fix: don't export empty drm card stats

Signed-off-by: Deezzir <[email protected]>

Author: Deezzir

sysfs/class_drm_amdgpu.go

@@ -81,8 +81,10 @@ func (fs FS) ClassDRMCardAMDGPUStats() ([]ClassDRMCardAMDGPUStats, error) {
 			}
 			return nil, err
 		}
-		cardStats.Name = filepath.Base(card)
-		stats = append(stats, cardStats)
+		if cardStats != (ClassDRMCardAMDGPUStats{}) {
+			cardStats.Name = filepath.Base(card)
+			stats = append(stats, cardStats)
+		}
 	}
 	return stats, nil
 }

sysfs/class_drm_amdgpu_test.go

@@ -49,16 +49,6 @@ func TestClassDRMCardAMDGPUStats(t *testing.T) {
 			DevName:                       "device",
 			DevType:                       "card0",
 		},
-		{
-			Name:                  "card1",
-			GPUBusyPercent:        0,
-			MemoryGTTSize:         0,
-			MemoryGTTUsed:         0,
-			MemoryVisibleVRAMSize: 0,
-			MemoryVisibleVRAMUsed: 0,
-			MemoryVRAMSize:        0,
-			MemoryVRAMUsed:        0,
-		},
 	}
 
 	if diff := cmp.Diff(classDRMCardStats, drmTest); diff != "" {