io.c: Fix comment since pthreads isn't the only threading libusb uses

diff --git a/libusb/io.c b/libusb/io.c
index 51b641d..58bdcdf 100644 (file)
--- a/libusb/io.c
+++ b/libusb/io.c
@@ -2020,7 +2020,7 @@ retry:
                return r;
        }
 
-       /* another thread is doing event handling. wait for pthread events that
+       /* another thread is doing event handling. wait for thread events that
         * notify event completion. */
        libusb_lock_event_waiters(ctx);