auto remove previous leftover socket

weed/command/filer.go

@@ -269,9 +269,9 @@ func (fo *FilerOptions) startFiler() {
 	if runtime.GOOS != "windows" {
 		if *fo.localSocket == "" {
 			*fo.localSocket = fmt.Sprintf("/tmp/seaweefs-filer-%d.sock", *fo.port)
-			if err := os.Remove(*fo.localSocket); err != nil && !os.IsNotExist(err) {
-				glog.Fatalf("Failed to remove %s, error: %s", *fo.localSocket, err.Error())
-			}
+		}
+		if err := os.Remove(*fo.localSocket); err != nil && !os.IsNotExist(err) {
+			glog.Fatalf("Failed to remove %s, error: %s", *fo.localSocket, err.Error())
 		}
 		go func() {
 			// start on local unix socket