udev: Handle all events only once

This fixes spontaneous USB reconfiguration causing "remove" event to be sent to
the daemon, which causes it to close itself if it did not have enough time to
connect to phone.

udev/39-usbmuxd.rules.in

@@ -1,10 +1,10 @@
 # usbmuxd (Apple Mobile Device Muxer listening on /var/run/usbmuxd)
 
 # systemd should receive all events relating to device
-SUBSYSTEM=="usb", ENV{PRODUCT}=="5ac/12[9a][0-9a-f]/*", TAG+="systemd"
+SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ENV{PRODUCT}=="5ac/12[9a][0-9a-f]/*", TAG+="systemd"
 
 # Initialize iOS devices into "deactivated" USB configuration state and activate usbmuxd
-SUBSYSTEM=="usb", ENV{PRODUCT}=="5ac/12[9a][0-9a-f]/*", ACTION=="add", ENV{USBMUX_SUPPORTED}="1", ATTR{bConfigurationValue}="0", OWNER="usbmux", @udev_activation_rule@
+SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ENV{PRODUCT}=="5ac/12[9a][0-9a-f]/*", ACTION=="add", ENV{USBMUX_SUPPORTED}="1", ATTR{bConfigurationValue}="0", OWNER="usbmux", @udev_activation_rule@
 
 # Exit usbmuxd when the last device is removed
-SUBSYSTEM=="usb", ENV{PRODUCT}=="5ac/12[9a][0-9a-f]/*", ACTION=="remove", RUN+="@sbindir@/usbmuxd -x"
+SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ENV{PRODUCT}=="5ac/12[9a][0-9a-f]/*", ACTION=="remove", RUN+="@sbindir@/usbmuxd -x"