Add delq list arg check

* src/fns.c (Fdelq): Check that list is a proper list.
This is more compatible with what ‘delete’ does.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/fns.c b/src/fns.c
index 0d93f824748..136a2198c2c 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -1589,6 +1589,7 @@ argument.  */)
       else
         prev = tail;
     }
+  CHECK_LIST_END (tail, list);
   return list;
 }