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Fixes gcc '-Wunused-but-set-variable' warning:

drivers/usb/serial/mos7840.c: In function 'mos7840_interrupt_callback':
drivers/usb/serial/mos7840.c:604:14: warning:
 variable 'st' set but not used [-Wunused-but-set-variable]

drivers/usb/serial/mos7840.c: In function 'mos7840_write':
drivers/usb/serial/mos7840.c:1303:17: warning:
 variable 'data1' set but not used [-Wunused-but-set-variable]

drivers/usb/serial/mos7840.c:1700:11: warning:
 variable 'iflag' set but not used [-Wunused-but-set-variable]

They are never used since introduction in commit 3f542974

 ("USB:
Moschip 7840 USB-Serial Driver")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Johan Hovold <johan@kernel.org>