fixed broken listify (it used to make (nil) when passed nil)

diff --git a/sql/expressions.lisp b/sql/expressions.lisp
index d09b154e0ef99907195f6b41f078f420e7c95283..c7236a454f56cb4c4c08a102c4ee61381c162996 100644 (file)
--- a/sql/expressions.lisp
+++ b/sql/expressions.lisp
@@ -801,9 +801,9 @@ uninclusive, and the args from that keyword to the end."
 
 (declaim (inline listify))
 (defun listify (x)
-  (if (atom x)
-      (list x)
-      x))
+  (if (listp x)
+      x
+      (list x)))
 
 (defmethod output-sql ((stmt sql-create-table) database)
   (flet ((output-column (column-spec)