JSON: Improve performance of json_events_cb()

The function tries to insert handles into JSON input for echo option.
Yet there may be nothing to do if the given netlink message doesn't
contain a handle, e.g. if it is an 'add element' command. Calling
seqnum_to_json() is pointless overhead in that case, and if input is
large this overhead is significant. Better wait with that call until
after checking if the message is relevant at all.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Eric Garver <eric@garver.life>

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