isdn/gigaset: unclog bas_gigaset AT response pipe
Recover from a lost HD_RECEIVEATDATA_ACK message by sending a zero-length HD_READ_ATMESSAGE command when ev_layer sends "+++". Signed-off-by: Tilman Schmidt <tilman@imap.cc> Signed-off-by: David S. Miller <davem@davemloft.net>
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