tarantool / tarantool / 15598

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iproto: don't attempt to close socket if it was not open

This can't entail any consequences, because socket fd is set to -1 in
this case, but this just looks a bit messy. Let's clean it up.

Follow-up commit 305dbcf68953 ("iproto: close socket explicitly before
wal_dir at exit").

(cherry picked from commit 37b883145)

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