Even though snp(4) in SVN is still broken, remove the unneeded D_NEEDMINOR.

kib@ and I have decided we will MFC the bpf(4)/snp(4) fixes after we've
released 7.1. Make sure the code in HEAD doesn't refer to a flag we
don't need anyway.

snp(4) in the MPSAFE TTY P4 branch already works, but still needs some
polishing before it can be integrated to SVN.

sys/dev/snp/snp.c

@@ -43,7 +43,7 @@ static	d_poll_t	snppoll;
 
 static struct cdevsw snp_cdevsw = {
 	.d_version =	D_VERSION,
-	.d_flags =	D_PSEUDO | D_NEEDGIANT | D_NEEDMINOR,
+	.d_flags =	D_PSEUDO | D_NEEDGIANT,
 	.d_open =	snpopen,
 	.d_read =	snpread,
 	.d_write =	snpwrite,