soc: aspeed: uart-routing: Use __sysfs_match_string

The existing use of match_string() caused it to reject 'echo foo' due
to the implicitly appended newline, which was somewhat ergonomically
awkward and inconsistent with typical sysfs behavior.  Using the
__sysfs_* variant instead provides more convenient and consistent
linefeed-agnostic behavior.
Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Fixes: c6807970 ("soc: aspeed: Add UART routing support")
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20230628083735.19946-2-zev@bewilderbeest.netSigned-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20230810122941.231085-1-joel@jms.id.auSigned-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/soc/aspeed/aspeed-uart-routing.c

@@ -524,7 +524,7 @@ static ssize_t aspeed_uart_routing_store(struct device *dev,
 	struct aspeed_uart_routing_selector *sel = to_routing_selector(attr);
 	int val;
 
-	val = match_string(sel->options, -1, buf);
+	val = __sysfs_match_string(sel->options, -1, buf);
 	if (val < 0) {
 		dev_err(dev, "invalid value \"%s\"\n", buf);
 		return -EINVAL;