gst/base/gstbasesink.c: Properly handle non GST_FORMAT_TIME segment

gst/base/gstbasesink.c: Properly handle non GST_FORMAT_TIME segment

Original commit message from CVS:
* gst/base/gstbasesink.c: (gst_base_sink_handle_object),
(gst_base_sink_event), (gst_base_sink_do_sync),
(gst_base_sink_activate_pull), (gst_base_sink_change_state):
Properly handle non GST_FORMAT_TIME segment
* gst/elements/gstidentity.c: (gst_identity_transform_ip):
Properly handle non GST_FORMAT_TIME segment
* gst/gstsegment.c:
This function is valid if the accumulator is 0 and the format
is different from the requested format.