usb: make usb_release_exclusive_storage private

Change-Id: I0383760b7d8e67cc99bbe4e4979bca92ef436c8d
Reviewed-on: http://gerrit.rockbox.org/1098
Reviewed-by: Amaury Pouly <amaury.pouly@gmail.com>

2 files changed, 2 insertions, 1 deletions

diff --git a/firmware/export/usb.h b/firmware/export/usb.h
index 74c4826006..ff85cb99ce 100644
--- a/firmware/export/usb.h
+++ b/firmware/export/usb.h
@@ -234,7 +234,6 @@ bool usb_driver_enabled(int driver);
 /* returns whether exclusive storage is available for USB */
 bool usb_exclusive_storage(void);
 #endif /* HAVE_USBSTACK */
-int usb_release_exclusive_storage(void);
 
 #ifdef USB_FIREWIRE_HANDLING
 bool firewire_detect(void);
diff --git a/firmware/usb.c b/firmware/usb.c
index a736f31ca5..e5210efc11 100644
--- a/firmware/usb.c
+++ b/firmware/usb.c
@@ -88,6 +88,8 @@ static long usb_last_broadcast_tick = 0;
 static bool usb_charging_only = false;
 #endif
 
+static int usb_release_exclusive_storage(void);
+
 #if defined(USB_FIREWIRE_HANDLING)
 static void try_reboot(void)
 {