[FS#603] umdns crashes on reboot

[LEDE Bugs]

The following task has a new comment added:

FS#603 - umdns crashes on reboot
User who did this - Damjan Georgievski (gdamjan)

----------
vaguely based on a chit-chat on irc, I'll test this patch later tonight (attached)…

hope uloop_timeout_cancel doesn't mind if the timeout hasn't been set
----------

One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=603#comment2108