avformat/hlsenc: improve hls encrypt get key file operation
authorSteven Liu <lq@chinaffmpeg.org>
Tue, 25 Jul 2017 02:31:29 +0000 (10:31 +0800)
committerSteven Liu <lq@chinaffmpeg.org>
Tue, 25 Jul 2017 02:31:29 +0000 (10:31 +0800)
get key file only once time is ok, no need more times.
Ticket-id: #6545

Found-by: JohnPi
Signed-off-by: Steven Liu <lq@onvideo.cn>

No differences found