gst/flv/gstflvparse.c: Properly check everywhere that we have enough data to parse...

gst/flv/gstflvparse.c: Properly check everywhere that we have enough data to parse and don't read outside the allocat...

Original commit message from CVS:
* gst/flv/gstflvparse.c: (FLV_GET_STRING),
(gst_flv_parse_tag_audio), (gst_flv_parse_tag_video),
(gst_flv_parse_tag_type), (gst_flv_parse_header):
Properly check everywhere that we have enough data to parse and
don't read outside the allocated memory region.