avformat/mpegts: Reset local nb_prg on add_program() failure
add_program() will deallocate the whole array on failure so
we must clear nb_prgs
Fixes: null pointer dereference
Fixes: crash-35a3b39ddcc5babeeb005b7399a3a1217c8781bc
Found-by: Catena cyber
Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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