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>

sound/oss/sb_mixer.h

@@ -1,5 +1,5 @@
 /*
- * sound/sb_mixer.h
+ * sound/oss/sb_mixer.h
  * 
  * Definitions for the SB Pro and SB16 mixers
  */