[sr-dev] [kamailio/kamailio] tm: t_suspend.c - t_continue_helper() - do not continue processing a reply if it's suspended again (#2721)

[Giacomo Vacca]

I've been testing a scenario where processing the HTTP requests took longer enough for SIP 200 retransmissions to be triggered.
In that case, `reply_received()` checks if the message was marked as suspended, but that works only if the onreply route calls `t_suspend()`.
The retransmission was dropped instead, so I had to look into the transaction's T_ASYNC_SUSPENDED flag.
The latest commit solves this, and should be safe for normal usages.
I need to test more edge cases, will update.

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