udev: actually check for existance of ID_PATH_TAG before we use it

src/71-seat.rules

@@ -16,6 +16,6 @@ SUBSYSTEM=="usb", ATTR{bDeviceClass}=="09", TAG+="seat"
 SUBSYSTEM=="usb", ATTR{idVendor}=="2230", ATTR{idProduct}=="0001", ENV{ID_AUTOSEAT}="1"
 
 TAG=="seat", ENV{ID_PATH}=="", IMPORT{program}="path_id %p"
-TAG=="seat", ENV{ID_FOR_SEAT}=="", ENV{ID_PATH}!="", ENV{ID_FOR_SEAT}="$env{SUBSYSTEM}-$env{ID_PATH_TAG}"
+TAG=="seat", ENV{ID_FOR_SEAT}=="", ENV{ID_PATH_TAG}!="", ENV{ID_FOR_SEAT}="$env{SUBSYSTEM}-$env{ID_PATH_TAG}"
 
 LABEL="seat_end"

src/logind.h

@@ -40,7 +40,6 @@
  *
  * udev:
  * drop redundant udev_device_get_is_initialized() use as soon as libudev is fixed
- * properly escape/remove : and . from seat names in udev rules
  * use device_has_tag() as soon as it is available
  * trigger based on libudev if available
  * enumerate recursively with libudev when triggering