commit bad4995703f97fab3c7c84b297a8ca6df65191fa
author Zhihai Xu <zhihaixu@google.com> Fri May 03 20:49:22 2013 -0700
committer Zhihai Xu <zhihaixu@google.com> Fri May 03 20:49:22 2013 -0700
tree e7dbb4f85c0d4ad38495db70faf979ace71a4da4
parent 009989730a294575c32295976c57af169523abe4

avoid null pointer in handlePanDeviceStateChange of PanService

see the following null pointer exception
04-30 15:15:21.689 10890 10890 E AndroidRuntime: Caused by: java.lang.NullPointerException
04-30 15:15:21.689 10890 10890 E AndroidRuntime: 	at com.android.bluetooth.pan.PanService.handlePanDeviceStateChange(PanService.java:457)
which cause crash when disable BT
If the stop is called before the cleanup in PanService, Nullpointer may happen.

issue 8769031

Change-Id: Ia3fb1625c945c508771a697234e6ee18a120d72b