USB: serial: fix TIOCMIWAIT return value
Fix regression introduced by commit 143d9d96 ("USB: serial: add tiocmiwait subdriver operation") which made the ioctl operation return ENODEV rather than ENOIOCTLCMD when a subdriver TIOCMIWAIT implementation is missing. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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