Audit hostname(1)

1) Be strict about argc
2) Fix a small error in the manpage

hostname.1

@@ -1,4 +1,4 @@
-.Dd January 30, 2015
+.Dd February 28, 2015
 .Dt HOSTNAME 1
 .Os sbase
 .Sh NAME
@@ -13,6 +13,6 @@ sets the current host name to
 .Ar name .
 If no
 .Ar name
-is given, the current hostname is written to stdout.
+is given, the current host name is written to stdout.
 .Sh SEE ALSO
 .Xr hostname 7