Trivially fix the following compile time warnings:
CC drivers/tty/serial/mcf.o
drivers/tty/serial/mcf.c: In function ‘mcf_set_termios’:
drivers/tty/serial/mcf.c:201:19: warning: unused variable ‘pp’
drivers/tty/serial/mcf.c: In function ‘mcf_config_rs485’:
drivers/tty/serial/mcf.c:444:19: warning: unused variable ‘pp’