[SCSI] small cleanups

This patch contains the following cleanups:
- make needlessly global functions static
- every file should #include the headers containing the prototypes for
  it's global functions

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 5143c89..e7b6a7f 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -175,7 +175,7 @@
  * an inode for that to work, and we do not always have one.
  */
 
-int sr_media_change(struct cdrom_device_info *cdi, int slot)
+static int sr_media_change(struct cdrom_device_info *cdi, int slot)
 {
 	struct scsi_cd *cd = cdi->handle;
 	int retval;