Fix issue #1078: ejabberd_c2s process didn't clear session data in some case #1083
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Notice that,
send_element/2
will callexit/1
if the connection is closed,So, if create session data before response bind-iq-result,
the ejabberd_c2s process may jump into
terminate/3
without update state data.As a result, it wouldn't delete the session data.
More details, see #1078
In short, we should call
send_element/2
beforeejabberd_sm:open_session
.