isdn/gigaset: avoid copying AT commands twice
Change the Gigaset driver's internal write_cmd interface to accept a cmdbuf structure instead of a string. This avoids copying formatted AT commands a second time. Impact: optimization Signed-off-by: NTilman Schmidt <tilman@imap.cc> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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