[at-spi2-core] atspi_table_cell_get_position: don't crash on error

[Mike Gorse <mgorse src gnome org>]

commit eba079f3e72e61e6b55d81727ab50c85d505d296
Author: Mike Gorse <mgorse suse com>
Date:   Mon Mar 27 12:57:35 2017 -0500

    atspi_table_cell_get_position: don't crash on error

 atspi/atspi-table-cell.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/atspi/atspi-table-cell.c b/atspi/atspi-table-cell.c
index c18e6dc..1df1fa9 100644
--- a/atspi/atspi-table-cell.c
+++ b/atspi/atspi-table-cell.c
@@ -163,9 +163,12 @@ atspi_table_cell_get_position (AtspiTableCell *obj,
   g_return_val_if_fail (obj != NULL, -1);
 
   reply = _atspi_dbus_call_partial (obj, "org.freedesktop.DBus.Properties",
-                                    "Get", NULL, "ss",
+                                    "Get", error, "ss",
                                     atspi_interface_table_cell, "Position");
          
+  if (!reply)
+    return -1;
+
   dbus_message_iter_init (reply, &iter);
 
   /* TODO: Return error here */