lavu/tx: add the inplace flag to PFA FFTs

They support in-place, because they have to use a temporary buffer.

libavutil/tx_template.c

@@ -836,7 +836,7 @@ static const FFTXCodelet TX_NAME(ff_tx_fft_pfa_##N##xM_def) = {                \
     .name       = TX_NAME_STR("fft_pfa_" #N "xM"),                             \
     .function   = TX_NAME(ff_tx_fft_pfa_##N##xM),                              \
     .type       = TX_TYPE(FFT),                                                \
-    .flags      = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE,                        \
+    .flags      = AV_TX_UNALIGNED | AV_TX_INPLACE | FF_TX_OUT_OF_PLACE,        \
     .factors    = { N, TX_FACTOR_ANY },                                        \
     .min_len    = N*2,                                                         \
     .max_len    = TX_LEN_UNLIMITED,                                            \