invalid error code

[Neal H Walfield]

gnupg fails to fail in the following scenario:

      neal at bassanio:~ (0)$ gpg --recv-key foo
      gpg: foo: not a valid key ID
      neal at bassanio:~ (0)$ 

(the number in parenthesis is the error code.)  Gnupg should, in this
case, return non-zero.

Thanks.