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>
(cherry picked from commit 31e47dfad0)

common/status.h

@@ -35,6 +35,7 @@ enum
     STATUS_ENTER,
     STATUS_LEAVE,
     STATUS_ABORT,
+    STATUS_CANCELED_BY_USER,
 
     STATUS_GOODSIG,
     STATUS_BADSIG,

g10/passphrase.c

@@ -409,7 +409,7 @@ 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;
         }
     }