Sugaya Taichi 6bc3703dcf serial: Fix using plain integer instead of Null pointer
Fix build warning that using plain integer as Null pointer.
This is reported by kbuild test robot.

Fixes: ba44dc043004 ("serial: Add Milbeaut serial control")
Signed-off-by: Sugaya Taichi <sugaya.taichi@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-25 11:37:41 +02:00
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