BUG/MINOR: server: Fix test on number of fields allowed in a server-state line

When a server-state line is parsed, a test is performed to be sure there is
enough but not too much fields. However the test is buggy. The bug was
introduced in the commit ea2cdf55e ("MEDIUM: server: Don't introduce a new
server-state file version").

No backport needed.
1 file changed