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/asm-generic/mutex-null.h b/include/asm-generic/mutex-null.h
index 254a126..e1bbbc7 100644
--- a/include/asm-generic/mutex-null.h
+++ b/include/asm-generic/mutex-null.h
@@ -1,5 +1,5 @@
 /*
- * asm-generic/mutex-null.h
+ * include/asm-generic/mutex-null.h
  *
  * Generic implementation of the mutex fastpath, based on NOP :-)
  *