[FIXED] JetStream: auto-ack callback ack handling #493
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If a message is already ack'ed (except for natsMsg_InProgress()),
the library should not attempt to ack the message when the
callback returns.
It is even more important if the user called natsMsg_Nak() since
if the callback ack'ed the message, it would defeat the purpose
of the Nak.
Resolves #492
Signed-off-by: Ivan Kozlovic ivan@synadia.com