Add a missing argument to libusb_wait_for_event

In the libusb_wait_for_event() sample code for section "Letting other
threads do the work for you" libusb_wait_for_event() was used without the
struct timeval *tv parameter.
The sample code was invalid and could not be compiled.

1 files changed, 1 insertions, 1 deletions

diff --git a/libusb/io.c b/libusb/io.c
index 90590ef..ab37e8d 100644
--- a/libusb/io.c
+++ b/libusb/io.c
@@ -859,7 +859,7 @@ if (libusb_try_lock_events(ctx) == 0) {
 			goto retry;
 		}
 
-		libusb_wait_for_event(ctx);
+		libusb_wait_for_event(ctx, NULL);
 	}
 	libusb_unlock_event_waiters(ctx);
 }