bug(truncate): when using --reference with `/var/run/snapd.socket` no errors

[HackingRepo]

Hi, uutils mainteners

we see when using --reference with /var/run/snapd.socket, no errors as out testing confirms

relunsec@relunsec:~/software/coreutils/target/debug$ ./truncate --reference /var/run/snapd.socket a
relunsec@relunsec:~/software/coreutils/target/debug$ echo $?
0
relunsec@relunsec:~/software/coreutils/target/debug$ gnutruncate --reference /var/run/snapd.socket a
gnutruncate: cannot get the size of '/var/run/snapd.socket': No such device or address
relunsec@relunsec:~/software/coreutils/target/debug$ echo $?
1
relunsec@relunsec:~/software/coreutils/target/debug$ 

as you can see the uu truncate no errors and exits with success, while the gnu one errors out to stderr and exits 1.