qerror: Extend QERR_DEVICE_ENCRYPTED

Include the name of the encrypted file.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/qmp.c b/qmp.c
index f218485..9c9ea62 100644
--- a/qmp.c
+++ b/qmp.c
@@ -135,7 +135,8 @@
     Error **err = opaque;
 
     if (!error_is_set(err) && bdrv_key_required(bs)) {
-        error_set(err, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs));
+        error_set(err, QERR_DEVICE_ENCRYPTED, bdrv_get_device_name(bs),
+                  bdrv_get_encrypted_filename(bs));
     }
 }