ftp: Fix STAT due to unexpected response

[g0tmi1k]

Before, it would only checking for "space at position 3" to signal "end".
After, it checks still for space AND a 3x numbers/digits at the start as well.

Demo

$ nc 10.0.0.10 21
220 (vsFTPd 2.3.4)
USER anonymous
331 Please specify the password.
PASS anonymous
230 Login successful.
STAT
211-FTP server status:
     Connected to 10.0.0.1
     Logged in as ftp
     TYPE: ASCII
     No session bandwidth limit
     Session timeout in seconds is 300
     Control connection is plain text
     Data connections will be plain text
     vsFTPd 2.3.4 - secure, fast, stable
211 End of status

---

This came about due to:

• Ftp anonymous #21422
• ftp_login: Various improvements #21379

[adfoster-r7]

Release Notes

Fixes a bug when parsing FTP server responses

[g0tmi1k]

Thanks @adfoster-r7 !