ctlsock: bind: address already in use after interrupted password input

[indev29]

Current behaviour

When mounting with -ctlsock option is interrupted via SIGINT (CTRL+C), ctlsock is created but not removed, which leads to bind: address already in use error on the next try.

> gocryptfs -ctlsock /run/user/$(id -u)/gocryptfs-lm.sock ~/cloud/lm ~/ws/lm
Password: ^C

> gocryptfs -ctlsock /run/user/$(id -u)/gocryptfs-lm.sock ~/cloud/lm ~/ws/lm
ctlsock: listen unix /run/user/1000/gocryptfs-lm.sock: bind: address already in use

I sometimes get this because I have a habit of interrupting the password input on a typo. For me, it is easier to retype the whole thing.

Expected behaviour

Interrupting password input should not affect the next try.

> gocryptfs -ctlsock /run/user/$(id -u)/gocryptfs-lm.sock ~/cloud/lm ~/ws/lm
Password: ^C

> gocryptfs -ctlsock /run/user/$(id -u)/gocryptfs-lm.sock ~/cloud/lm ~/ws/lm
Password: 
Decrypting master key
Filesystem mounted and ready.

Possible solution

Remove ctlsock if password input was interrupted.

Version

gocryptfs v2.4.0; go-fuse [vendored]; 2023-06-15 go1.20.5 linux/amd64