dfork: close all fds >=3, including 3 itself
diff --git a/libdaemon/dfork.c b/libdaemon/dfork.c
index e705155..2f57f1c 100644
--- a/libdaemon/dfork.c
+++ b/libdaemon/dfork.c
@@ -515,7 +515,7 @@
                 return -1;
             }
 
-            if (fd <= 3)
+            if (fd < 3)
                 continue;
 
             if (fd == dirfd(d))