avformat/hlsenc: improve hls encrypt get key file operation
get key file only once time is ok, no need more times.
Ticket-id: #6545
Found-by: JohnPi
Signed-off-by: NSteven Liu <lq@onvideo.cn>
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get key file only once time is ok, no need more times.
Ticket-id: #6545
Found-by: JohnPi
Signed-off-by: NSteven Liu <lq@onvideo.cn>