Thomas Guillem authored Nov 09, 2015 and Rémi Denis-Courmont committed Nov 11, 2015

This commit fixes the following assert in the DecoderThread function:
"assert( vlc_fifo_IsEmpty( p_owner->p_fifo) );"

Indeed, if input_DecoderFlush is called again (just after), p_owner->flushed
will be true and the input won't wait for the DecoderThread. As a consequence,
the input will send blocks while the DecoderThread is flushing, hence the
assert.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>