FFmpeg/libavfilter
Jun Zhao 0320dab265 lavfi/dnn: check the return value from sws_getContext
sws_getContext may be return NULL, and it's will be dereferenced,
so add the check.

Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
2020-12-12 13:34:30 +08:00
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