rtsp: do not call fwrite() with NULL pointer FILE * #1874
Closed
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If the default write callback is used and no destination has been set, a
NULL pointer would be passed to fwrite()'s 4th argument.
OSS-fuzz bug https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3327 (not publicly open yet)
Detected by OSS-fuzz
cc @cmeister2