gst/subparse/samiparse.c: Only output characters inside the "sync" elements. There...

gst/subparse/samiparse.c: Only output characters inside the "sync" elements. There could be other elements like "styl...

Original commit message from CVS:
Patch by: Young-Ho Cha <ganadist at chollian dot net>
* gst/subparse/samiparse.c: (handle_start_sync),
(start_sami_element), (end_sami_element), (characters_sami),
(sami_context_reset):
Only output characters inside the "sync" elements. There could be
other elements like "style" that have some content but should
not be printed. Fixes bug #467911.