[PATCH] USB: 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: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index 22ad1a5..2edf9cab 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -2843,7 +2843,7 @@
  * Free the buffer and all associated memory.
  */
 
-void edge_buf_free(struct edge_buf *eb)
+static void edge_buf_free(struct edge_buf *eb)
 {
 	if (eb) {
 		kfree(eb->buf_buf);