[FFmpeg-devel] [PATCH] avfft: avoid overreads with RDFT API users

[Lynne]

The new API requires an extra array member at the very end,
which old API users did not do.

This disables in-place RDFT transforms and instead
does the transform out of place by copying once, there shouldn't
be a significant loss of speed as our in-place FFT requires a reorder
which is likely more expensive in the majority of cases to do.

Patch attached.

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