avformat/rpl: Check for EOF and zero framesize
Fixes: Infinite loop
Fixes: 34751/clusterfuzz-testcase-minimized-ffmpeg_dem_RPL_fuzzer-
5439330800762880
Fixes: 34774/clusterfuzz-testcase-minimized-ffmpeg_dem_RPL_fuzzer-
5851571660390400
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit
a0a4a527c3b0819368d9b148542bb7663f39df79)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>