Make name and value outputs of key_nextattr optional.

diff --git a/key-attr.c b/key-attr.c
index 2d33b9c..61b12d5 100644 (file)
--- a/key-attr.c
+++ b/key-attr.c
@@ -117,8 +117,8 @@ int key_nextattr(key_attriter *i, const char **n, const char **v)
   key_attr *a = sym_next(&i->i);
   if (!a)
     return (0);
-  *n = SYM_NAME(a);
-  *v = a->p;
+  if (n) *n = SYM_NAME(a);
+  if (v) *v = a->p;
   return (1);
 }