Avoid NPE in system_server in bringDownServiceLocked()

While stoping the service is scheduleUnbindService()
is failing with exception , no need to update the OOM
value of the process as processRecord is already set
to NULL.

Test: Monkey or directed (see bug)
Bug: 136627142
Change-Id: Ic766b91e6dc47b8ff727026863bab2437f9be420

services/core/java/com/android/server/am/ActiveServices.java

@@ -2935,7 +2935,9 @@ public final class ActiveServices {
                     } catch (Exception e) {
                         Slog.w(TAG, "Exception when unbinding service "
                                 + r.shortInstanceName, e);
+                        needOomAdj = false;
                         serviceProcessGoneLocked(r);
+                        break;
                     }
                 }
             }