Fix memory leak when reinitializing stream encoder.
Fix memory leak when reinitializing stream encoder.

http://sourceforge.net/tracker/?func=detail&aid=3390048&group_id=13478&atid=313478

LordJZ/libflac,Distrotech/flac,waitman/flac,LordJZ/libflac,kode54/flac,kode54/flac,waitman/flac,fredericgermain/flac,kode54/flac,fredericgermain/flac,kode54/flac,waitman/flac,Distrotech/flac,waitman/flac,fredericgermain/flac,LordJZ/libflac,Distrotech/flac,waitman/flac,Distrotech/flac,fredericgermain/flac,LordJZ/libflac