BUG: _handle_pad_byte(fid, size)
BUG: _handle_pad_byte(fid, size)

Odd-length chunks have a padding byte after them, which was not being
seeked past, corrupting further reads.

Fixes #10332 (for real this time)

#12110 was actually misguided because I thought the extra byte was
"extraneous" and should be ignored if data is already received.  It's
still good to ignore extraneous bytes if the data is received, but this
byte is actually correct, and it was a bug that scipy was not skipping
it.

fmt chunk is always even-length, which is why data chunk was read
correctly and this wasn't noticed.

Odd-length 8-bit mono files will also trip this up, and any chunks after
data chunk will be read incorrectly.  (Required for future enhancements)

Inspired by
https://github.com/X-Raym/wavfile.py/commit/7742bb0d1f49ace84b49ef8379f78efbe0a3f15d#diff-ff5dc7839160fb901e1df7a103f80ba5R88

grlee77/scipy,Eric89GXL/scipy,andyfaff/scipy,nmayorov/scipy,matthew-brett/scipy,scipy/scipy,pizzathief/scipy,scipy/scipy,pizzathief/scipy,matthew-brett/scipy,zerothi/scipy,WarrenWeckesser/scipy,zerothi/scipy,scipy/scipy,ilayn/scipy,perimosocordiae/scipy,nmayorov/scipy,scipy/scipy,e-q/scipy,andyfaff/scipy,tylerjereddy/scipy,e-q/scipy,anntzer/scipy,ilayn/scipy,anntzer/scipy,scipy/scipy,pizzathief/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,grlee77/scipy,andyfaff/scipy,mdhaber/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,grlee77/scipy,endolith/scipy,rgommers/scipy,Eric89GXL/scipy,Eric89GXL/scipy,Stefan-Endres/scipy,grlee77/scipy,anntzer/scipy,Eric89GXL/scipy,anntzer/scipy,pizzathief/scipy,ilayn/scipy,ilayn/scipy,mdhaber/scipy,tylerjereddy/scipy,vigna/scipy,e-q/scipy,andyfaff/scipy,rgommers/scipy,nmayorov/scipy,perimosocordiae/scipy,rgommers/scipy,ilayn/scipy,Stefan-Endres/scipy,matthew-brett/scipy,nmayorov/scipy,nmayorov/scipy,andyfaff/scipy,zerothi/scipy,WarrenWeckesser/scipy,tylerjereddy/scipy,Eric89GXL/scipy,mdhaber/scipy,perimosocordiae/scipy,tylerjereddy/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,mdhaber/scipy,endolith/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,anntzer/scipy,endolith/scipy,matthew-brett/scipy,vigna/scipy,zerothi/scipy,rgommers/scipy,endolith/scipy,vigna/scipy,e-q/scipy,e-q/scipy,vigna/scipy,rgommers/scipy,grlee77/scipy,andyfaff/scipy,Eric89GXL/scipy,endolith/scipy,pizzathief/scipy,anntzer/scipy,matthew-brett/scipy,mdhaber/scipy,mdhaber/scipy,scipy/scipy,endolith/scipy,perimosocordiae/scipy,zerothi/scipy,zerothi/scipy,Stefan-Endres/scipy,vigna/scipy,perimosocordiae/scipy,ilayn/scipy,tylerjereddy/scipy