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TLS: check for sock->recv_cb when handling received data

Artem Boldariev requested to merge artem-tls-check-for-recv_cb into main

This commit adds a check if 'sock->recv_cb' might have been nullified during the call to 'sock->recv_cb'. That could happen, e.g. by an indirect call to 'isc_nmhandle_close()' from within the callback when wrapping up.

In this case, let's close the TLS connection.

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