critical bugfix for afl-tmin

src/afl-forkserver.c

@@ -43,6 +43,8 @@
 /* a program that includes afl-forkserver needs to define these */
 extern u8  uses_asan;
 extern u8 *trace_bits;
+extern u8  use_stdin;
+
 extern s32 forksrv_pid, child_pid, fsrv_ctl_fd, fsrv_st_fd;
 extern s32 out_fd, out_dir_fd, dev_null_fd;     /* initialize these with -1 */
 #ifndef HAVE_ARC4RANDOM
@@ -211,7 +213,7 @@ void init_forkserver(char **argv) {
 
     }
 
-    if (out_file) {
+    if (!use_stdin) {
 
       dup2(dev_null_fd, 0);