internal/uevent: optionally pass UUID during coldboot

This enables rejection of non-coldboot synthetic events.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/uevent/coldboot_test.go

@@ -59,7 +59,7 @@ func TestColdboot(t *testing.T) {
 		}
 	})
 
-	err := uevent.Coldboot(t.Context(), d, visited, func(err error) error {
+	err := uevent.Coldboot(t.Context(), d, nil, visited, func(err error) error {
 		t.Errorf("handleWalkErr: %v", err)
 		return err
 	})
@@ -219,7 +219,7 @@ func TestColdbootError(t *testing.T) {
 				}
 			}
 
-			if err := uevent.Coldboot(ctx, d, visited, handleWalkErr); !reflect.DeepEqual(err, wantErr) {
+			if err := uevent.Coldboot(ctx, d, new(uevent.UUID), visited, handleWalkErr); !reflect.DeepEqual(err, wantErr) {
 				t.Errorf("Coldboot: error = %v, want %v", err, wantErr)
 			}
 		})