[gtk+/gtk-3-22] bindings: Avoid iterating array if it is never set

[Daniel Boles <dboles src gnome org>]

commit 7dd33497518e98806216c140728ad2a7114fb015
Author: Daniel Boles <dboles src gnome org>
Date:   Tue Aug 1 20:41:23 2017 +0100

    bindings: Avoid iterating array if it is never set
    
    If query.return_type is not one we want, binding_compose_params() is
    not called, and so params remains a NULL pointer. However, the code was
    then unconditionally iterating it regardless. Don't if it is still NULL.
    
    CID 1452218 (#1 of 1): Explicit null dereferenced (FORWARD_NULL)
    15. var_deref_op: Dereferencing null pointer params.

 gtk/gtkbindings.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkbindings.c b/gtk/gtkbindings.c
index a06a050..653bc31 100644
--- a/gtk/gtkbindings.c
+++ b/gtk/gtkbindings.c
@@ -654,9 +654,13 @@ gtk_binding_entry_activate (GtkBindingEntry *entry,
       else
         handled = TRUE;
 
-      for (i = 0; i < query.n_params + 1; i++)
-        g_value_unset (&params[i]);
-      g_free (params);
+      if (params != NULL)
+        {
+          for (i = 0; i < query.n_params + 1; i++)
+            g_value_unset (&params[i]);
+
+          g_free (params);
+        }
 
       if (entry->destroyed)
         break;