prevent core dump when the input file is not present

diff --git a/util/misc/convert.c b/util/misc/convert.c
index a599b97..9306dfd 100644 (file)
--- a/util/misc/convert.c
+++ b/util/misc/convert.c
@@ -84,7 +84,7 @@ error(s,a1,a2,a3,a4)
 fatal(s,a1,a2,a3,a4)
        char *s;
 {
-       C_close();
+       if (C_busy()) C_close();
        error(s,a1,a2,a3,a4);
        exit(1);
 }