ALSA: line6: Make line6_send_raw_message() static

It's used only locally.
Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/line6/driver.c

@@ -88,7 +88,7 @@ static void line6_stop_listen(struct usb_line6 *line6)
 /*
 	Send raw message in pieces of wMaxPacketSize bytes.
 */
-int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
+static int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
 				  int size)
 {
 	int i, done = 0;

sound/usb/line6/driver.h

@@ -169,8 +169,6 @@ extern int line6_read_data(struct usb_line6 *line6, int address, void *data,
 extern int line6_read_serial_number(struct usb_line6 *line6,
 				    int *serial_number);
 extern int line6_send_program(struct usb_line6 *line6, u8 value);
-extern int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
-				  int size);
 extern int line6_send_raw_message_async(struct usb_line6 *line6,
 					const char *buffer, int size);
 extern int line6_send_sysex_message(struct usb_line6 *line6,