wl12xx: use kstrtoul functions

Use the new kstrtoul functions instead of the deprecated strict_strtoul().

Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/debugfs.c b/drivers/net/wireless/wl12xx/debugfs.c
index 8e75b09..70ab198 100644
--- a/drivers/net/wireless/wl12xx/debugfs.c
+++ b/drivers/net/wireless/wl12xx/debugfs.c
@@ -267,7 +267,7 @@
 	}
 	buf[len] = '\0';
 
-	ret = strict_strtoul(buf, 0, &value);
+	ret = kstrtoul(buf, 0, &value);
 	if (ret < 0) {
 		wl1271_warning("illegal value in gpio_power");
 		return -EINVAL;