gpg: Add canceled status message.

* common/status.h (STATUS_CANCELED_BY_USER): New.
* g10/passphrase.c (passphrase_to_dek): Send STATUS_CANCELED_BY_USER
instead of STATUS_MISSING_PASSPHRASE when canceled is set.
--

This is to prevent further pinentry tries when the pinentry is canceled
by the user during symmetric decryption.

Signed-off-by: Ben Kibbey <bjk@luxsci.net>

g10/passphrase.c

@@ -359,7 +359,7 @@ passphrase_to_dek (int cipher_algo, STRING2KEY *s2k,
       if (*canceled)
         {
           xfree (pw);
-	  write_status( STATUS_MISSING_PASSPHRASE );
+	  write_status( STATUS_CANCELED_BY_USER );
           return NULL;
         }
     }