If -P and -c were given, a second pledge call tried to add "rpath" to the

If -P and -c were given, a second pledge call tried to add "rpath" to the
first pledge promises, so nc exited with EPERM. To fix this, merge the
pledge of the Pflag && usetls case into the first pledge block. This
allows us to get rid of the second pledge block and thus to simplify the
logic a bit. While there, add a missing blank to an error string.

Joint effort by the #openbsd-daily code reading group, problem found and
initial patch by <rain1 openmailbox org>.

ok awolk