lavu/opt: handle NULL obj in av_opt_next
It indirectly also fixes av_opt_free for NULL objs.
Signed-off-by: NLukasz Marek <lukasz.m.luki2@gmail.com>
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It indirectly also fixes av_opt_free for NULL objs.
Signed-off-by: NLukasz Marek <lukasz.m.luki2@gmail.com>