presence_dialoginfo: get rid of unused variables warning

- priority and winning_priority are used in an alternative winning node
  selection which is disabled now
- reported by Jua Heinanen

(cherry picked from commit 4f4641ea2a4018a72558c40d4878e9af7053be2d)
siputils: allocate enough space to hold ending zero for tel uri in tel2sip()

- reported by Juha Heinanen

(cherry picked from commit 7992a2b8d42bb7e8bcf1738cf042013ed126a47a)