agetty: double equals sign typo in opentty()

[Francesco Cosoleto <cosoleto@xxxxxxxxx>]

Hello.

agetty.c(988): warning #187: use of "=" where "==" may have been intended
        if (ioctl(STDIN_FILENO, TIOCMGET, &serial) < 0 && (errno = EINVAL)) {
                                                          ^
This was spotted by Intel Compiler.

Francesco
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