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/sound/oss/mpu401.c b/sound/oss/mpu401.c
index 0aac54c..321f4c4 100644
--- a/sound/oss/mpu401.c
+++ b/sound/oss/mpu401.c
@@ -1,5 +1,5 @@
 /*
- * sound/mpu401.c
+ * sound/oss/mpu401.c
  *
  * The low level driver for Roland MPU-401 compatible Midi cards.
  */