kernel/printk.c: comment fix

Signed-off-by: Patrick Pletscher <pat@pletscher.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/kernel/printk.c b/kernel/printk.c
index 0c15187..4b47e59 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -54,7 +54,7 @@
 };
 
 /*
- * Low lever drivers may need that to know if they can schedule in
+ * Low level drivers may need that to know if they can schedule in
  * their unblank() callback or not. So let's export it.
  */
 int oops_in_progress;