USB: serial: make usb_serial_driver::chars_in_buffer return uint

tty_operations::chars_in_buffer is being switched to return uint. Do the
same for usb_serial_driver's chars_in_buffer.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
[ johan: amend commit message ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Jiri Slaby 2021-05-05 11:19:20 +02:00 • committed by Johan Hovold
commit 155591d3ce
14 changed files with 39 additions and 39 deletions