n_gsm: Constify u8 and unsigned char usage

In order to prepare for adding serdev driver support, let's constify
the use of u8 and unsigned char for n_gsm.

Note that gsm_control_modem() gsm_control_rls() read the data for tty
control characters and then call gsm_control_reply() that allocates a
new reply and copies the data.

Cc: [email protected]
Cc: Alan Cox <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Johan Hovold <[email protected]>
Cc: Peter Hurley <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Sebastian Reichel <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

0 files changed, 0 insertions, 0 deletions