_atspi-dbus_call_partial: Check for error.
_atspi-dbus_call_partial: Check for error.

Dbind may return a message containing an error, so check for this in
_atspi_dbus_call_partial. I an error is set, then do not return the
message, but set the GError. This fixes some warnings where the error
message was being passed to _atspi_dbus_return_accessible_from_message.

GNOME/at-spi2-core,GNOME/at-spi2-core,GNOME/at-spi2-core