isdn/gigaset: fix bas_gigaset interrupt read error handling
Rework the handling of USB errors in interrupt input reads to clear halts correctly, delay URB resubmission after errors, limit retries, and improve error recovery. Signed-off-by: NTilman Schmidt <tilman@imap.cc> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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