exit round-robin vcpu loop if cpu->stopped is true

Sometimes vcpus are stopped directly without going through ->stop = 1.
Exit the VCPU execution loop in this case as well.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

cpus.c

@@ -1098,7 +1098,7 @@ bool cpu_exec_all(void)
                 cpu_handle_debug_exception(env);
                 break;
             }
-        } else if (env->stop) {
+        } else if (env->stop || env->stopped) {
             break;
         }
     }