Append to INBOX if an explicit path wasn't supplied.

@@ -889,9 +889,14 @@ imap_append_message0 (mailbox_t mailbox, message_t msg)
 	  url_get_path (mailbox->url, NULL, 0, &n);
 	  if (n == 0)
 	    {
+	      if (!(path = strdup ("INBOX")))
+		{
 		  free (abuf);
-	      return EINVAL;
+		  return ENOMEM;
+		}
 	    }
+	  else
+	    {
 	      path = calloc (n + 1, sizeof (*path));
 	      if (path == NULL)
 		{
@@ -900,6 +905,7 @@ imap_append_message0 (mailbox_t mailbox, message_t msg)
 		}
 	      url_get_path (mailbox->url, path, n + 1, NULL);
 	    }
+	}
 
 	/* FIXME: we need to get the envelope_date and use it.
 	   currently it is ignored.  */
@@ -970,7 +976,7 @@ imap_append_message0 (mailbox_t mailbox, message_t msg)
       MAILBOX_DEBUG0 (m_imap->mailbox, MU_DEBUG_PROT, f_imap->buffer);
 
     default:
-      /* mu_error ("imap_append: unknow state\n"); */
+      /* mu_error ("imap_append: unknown state\n"); */
       break;
     }
   f_imap->state = IMAP_NO_STATE;