fix file specification in comments

Many files include the filename at the beginning, serveral used a wrong one.

Signed-off-by: Uwe Zeisberger <Uwe_Zeisberger@digi.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/include/linux/slab.h b/include/linux/slab.h
index a96fd93..70be57d 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -1,5 +1,5 @@
 /*
- * linux/mm/slab.h
+ * linux/include/linux/slab.h
  * Written by Mark Hemment, 1996.
  * (markhe@nextd.demon.co.uk)
  */