Fix misleading indentation warning:

libexec/rshd/rshd.c:442:5: error: misleading indentation; statement is not part of the previous 'else' [-Werror,-Wmisleading-indentation]

ioctl(pv[0], FIONBIO, (char *)&one);
^

libexec/rshd/rshd.c:440:4: note: previous statement is here

else
^

Direct commit to stable/11, since rshd has been removed from FreeBSD 12
and later.