ser_gigaset: fix up NULL checks
Commit f34d7a5b ("tty: The big operations rework") changed tty->driver to tty->ops but left NULL checks for tty->driver untouched. Fix. Signed-off-by: Tilman Schmidt <tilman@imap.cc> [pebolle: removed Fixes tag] Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: David S. Miller <davem@davemloft.net>
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