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: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/cpus.c b/cpus.c
index c5743c4..785a104 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1098,7 +1098,7 @@
                 cpu_handle_debug_exception(env);
                 break;
             }
-        } else if (env->stop) {
+        } else if (env->stop || env->stopped) {
             break;
         }
     }