lal/src/fft: reinstate error codes

to get intel fft to build
31 jobs for ci-conda in 106 minutes and 53 seconds (queued for 4 minutes and 15 seconds)
Status Job ID Name Coverage
  .Pre
passed #530397
make-dist

00:07:22

 
  Lal
passed #530400
lal:conda:fftw

00:13:30

passed #530401
lal:conda:mkl

00:12:09

passed #530399
lal:deb

00:27:49

passed #530398
lal:rpm

00:16:07

 
  Lal Frame
passed #530404
lalframe:conda

00:11:03

passed #530403
lalframe:deb

00:04:14

passed #530402
lalframe:rpm

00:03:41

 
  Lal Meta Io
passed #530407
lalmetaio:conda

00:06:49

passed #530406
lalmetaio:deb

00:04:40

passed #530405
lalmetaio:rpm

00:04:53

 
  Lal Simulation
passed #530410
lalsimulation:conda

00:11:23

passed #530409
lalsimulation:deb

00:15:26

passed #530408
lalsimulation:rpm

00:07:57

 
  Lal Burst
passed #530413
lalburst:conda

00:10:00

passed #530412
lalburst:deb

00:14:16

passed #530411
lalburst:rpm

00:11:29

 
  Lal Inspiral
passed #530416
lalinspiral:conda

00:11:55

passed #530415
lalinspiral:deb

00:13:11

passed #530414
lalinspiral:rpm

00:09:11

 
  Lal Pulsar
passed #530419
lalpulsar:conda

00:13:00

passed #530418
lalpulsar:deb

00:17:23

passed #530417
lalpulsar:rpm

00:12:21

 
  Lal Inference
passed #530422
lalinference:conda

00:14:55

passed #530421
lalinference:deb

00:07:30

passed #530420
lalinference:rpm

00:07:49

 
  Lal Apps
passed #530425
lalapps:conda

00:13:38

passed #530424
lalapps:deb

00:10:48

passed #530423
lalapps:rpm

00:07:17

 
  Documentation
passed #530426
documentation

00:07:55

 
  Integration Tests
passed #530427
top-level

00:40:14