SipService: fix a missing switch-case break.

Change-Id: I638eecd8000293d4cb37b3595c02ca33df4924eb
diff --git a/voip/java/com/android/server/sip/SipService.java b/voip/java/com/android/server/sip/SipService.java
index ee554b5..6f426c9 100644
--- a/voip/java/com/android/server/sip/SipService.java
+++ b/voip/java/com/android/server/sip/SipService.java
@@ -868,6 +868,7 @@
                     case SipErrorCode.SERVER_UNREACHABLE:
                         if (DEBUG) Log.d(TAG, "   pause auto-registration");
                         stop();
+                        break;
                     default:
                         restartLater();
                 }