Small fix to "correctly" parse PGP inline signed mails by
(presumingly) GPGMail 1.4.1

Content-Type: application/pgp; format=text; x-action=sign

and inline separators as:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

<body>
-----BEGIN PGP SIGNATURE-----

<signature>
-----END PGP SIGNATURE-----

former version only tried to decrypt body, which in this case obviously
fails.
cleanup: previous patch