bug(find): not error out when the --files0-from is invalid UTF8 like \xFF

[HackingRepo]

Hi, findutils mainteners

i confirmed that the uu find do not output any errors when a.txt contains \xFF

relunsec@relunsec:~/software/findutils/target/debug$ sudo ./find -files0-from a.txt
relunsec@relunsec:~/software/findutils/target/debug$ echo $'\xFF\nfile2.txt' > a.txt
relunsec@relunsec:~/software/findutils/target/debug$ sudo ./find -files0-from a.txt
relunsec@relunsec:~/software/findutils/target/debug$ sudo /bin/find -files0-from a.txt
/bin/find: ‘\377\nfile2.txt\n’: Invalid or incomplete multibyte or wide character
relunsec@relunsec:~/software/findutils/target/debug$