kernel/printk.c: comment fix

Signed-off-by: Patrick Pletscher <pat@pletscher.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

kernel/printk.c

@@ -54,7 +54,7 @@ int console_printk[4] = {
 };
 
 /*
- * 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;