McdAccount: Requests: make create_request less precarious by returning a ref
McdAccount: Requests: make create_request less precarious by returning a ref

Returning a ref borrowed from the status-changed signal connection
is technically also correct, because account_request_common() doesn't
currently give that signal a chance to occur - but it's less fragile
to have too many references.

freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control