[riot-notifications] [RIOT] sys/vtimer: Remove timer before adding. (#3260)

Oleg Hahm notifications at github.com
Tue Jun 30 23:35:02 CEST 2015

If `timer` is `NULL` `timer_get_node()` returns `NULL`, thus, `priority_queue_remove()` will try to remove a non-existing node (`NULL`) which should do nothing.

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