USB: digi_accelport.c trivial sparse lock annotation

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index d96302d..28bc6fc 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -571,6 +571,7 @@
 static long cond_wait_interruptible_timeout_irqrestore(
 	wait_queue_head_t *q, long timeout,
 	spinlock_t *lock, unsigned long flags)
+__releases(lock)
 {
 	DEFINE_WAIT(wait);