tty: replace strict_strtoul() with kstrtoul()

The usage of strict_strtoul() is not preferred, because
strict_strtoul() is obsolete. Thus, kstrtoul() should be
used.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index b51c154..5f68f2c 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -932,7 +932,7 @@
 	unsigned long val;
 	int error;
 
-	error = strict_strtoul(buffer, 0, &val);
+	error = kstrtoul(buffer, 0, &val);
 	if (error < 0)
 		return error;