examples/async.c: remove unused includes

diff --git a/examples/async.c b/examples/async.c
index 4fc9631..63933c8 100644 (file)
--- a/examples/async.c
+++ b/examples/async.c
@@ -19,8 +19,6 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
 #include <unistd.h>
 #include <getopt.h>
 #include <ftdi.h>