Fix return value after the interaction dialog has been used.

modules/demux/live555.cpp

@@ -479,6 +479,7 @@ createnew:
     }
 
 describe:
+msg_Info( p_demux, "[%s] user=%s pwd=%s", psz_url, psz_user, psz_pwd );
     authenticator.setUsernameAndPassword( (const char*)psz_user,
                                           (const char*)psz_pwd );
 
@@ -517,6 +518,7 @@ describe:
                             psz_login, psz_password );
                 if( psz_login ) psz_user = psz_login;
                 if( psz_password ) psz_pwd = psz_password;
+                i_ret = VLC_SUCCESS;
                 goto describe;
             }
             if( psz_login ) free( psz_login );