TTY: amiserial, pass tty down to functions
This avoids pain with tty refcounting and touching tty_port in the future. It allows us to remove some info->tty tests because the tty passed down to them can never be NULL. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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