[at-spi2-core] Check that message is non-NULL before calling libdbus

[Mike Gorse <mgorse src gnome org>]

commit d20f38c58e79d41c1b09aad61b13901ad4348387
Author: Mike Gorse <mgorse suse com>
Date:   Tue Jan 15 10:07:12 2013 -0600

    Check that message is non-NULL before calling libdbus
    
    _atspi_dbus_call_partial now checks for an error message, but it should
    first check that the message is not NULL, or libdbus will abort.

 atspi/atspi-misc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/atspi/atspi-misc.c b/atspi/atspi-misc.c
index e4ef09f..471d6a1 100644
--- a/atspi/atspi-misc.c
+++ b/atspi/atspi-misc.c
@@ -1174,7 +1174,7 @@ out:
     dbus_error_free (&err);
   }
 
-  if (dbus_message_get_type (reply) == DBUS_MESSAGE_TYPE_ERROR)
+  if (reply && dbus_message_get_type (reply) == DBUS_MESSAGE_TYPE_ERROR)
   {
     const char *err_str = NULL;
     dbus_message_get_args (reply, NULL, DBUS_TYPE_STRING, &err_str, DBUS_TYPE_INVALID);