[pygobject] Fix caller-allocates emergency free.

[Simon van der Linden <svdlinden src gnome org>]

commit e4c4cccb588b258dbcd21702e6cddcfe9ebe4ffc
Author: Simon van der Linden <svdlinden gnome org>
Date:   Thu Aug 12 11:09:37 2010 +0200

    Fix caller-allocates emergency free.
    
    In the state, args, args[i], arg_infos[i], and arg_type_infos[i] must not be
    NULL in order to be able caller-allocates. This patch adds those conditions.
    
    Moreover, the interface info needs to be freed afterwards.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=626684

 gi/pygi-invoke.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/gi/pygi-invoke.c b/gi/pygi-invoke.c
index e3c6dc9..d8e4b35 100644
--- a/gi/pygi-invoke.c
+++ b/gi/pygi-invoke.c
@@ -938,12 +938,17 @@ _free_invocation_state (struct invocation_state *state)
     for (i = 0; i < state->n_args; i++) {
 
         /* check for caller-allocated values we need to free */
-        if (g_arg_info_is_caller_allocates (state->arg_infos[i])) {
+        if (state->args != NULL
+            && state->args[i] != NULL
+            && state->arg_infos[i] != NULL
+            && state->arg_type_infos[i] != NULL
+            && g_arg_info_is_caller_allocates (state->arg_infos[i])) {
             GIBaseInfo *info;
             GIInfoType info_type;
 
             info = g_type_info_get_interface (state->arg_type_infos[i]);
             g_assert (info != NULL);
+
             info_type = g_base_info_get_type (info);
 
             /* caller-allocates applies only to structs right now
@@ -959,6 +964,8 @@ _free_invocation_state (struct invocation_state *state)
                     g_free (state->args[i]);
                 }
             }
+
+            g_base_info_unref (info);
         }
 
         if (state->arg_type_infos[i] != NULL)