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: linux-serial@vger.kernel.org Cc: Alan Cox <alan@llwyncelyn.cymru> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Johan Hovold <johan@kernel.org> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Rob Herring <robh@kernel.org> Cc: Sebastian Reichel <sre@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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