serial: sh-sci: Change checking for error rate of HSCIF

This changes negative values of error rate to be checked, because these
values are valid as error rate. And this changes in the process of adopting
a value close to 0.
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/sh-sci.c

@@ -1812,9 +1812,6 @@ static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq,
 			err = DIV_ROUND_CLOSEST(freq, ((br + 1) * bps * sr *
 					       (1 << (2 * c + 1)) / 1000)) -
 					       1000;
-			if (err < 0)
-				continue;
-
 			/* Calc recv margin
 			 * M: Receive margin (%)
 			 * N: Ratio of bit rate to clock (N = sampling rate)
@@ -1829,7 +1826,7 @@ static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq,
 			 */
 			recv_margin = abs((500 -
 					DIV_ROUND_CLOSEST(1000, sr << 1)) / 10);
-			if (min_err > err) {
+			if (abs(min_err) > abs(err)) {
 				min_err = err;
 				recv_max_margin = recv_margin;
 			} else if ((min_err == err) &&