[RILMODEM] removing unnecessary empty lines and null check

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[RILMODEM] change cb_data_new2 to abort in failure

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>