tree b0ceb5b09377a0f002853cc08329ae717c3f6071
parent 642c0be3f35354df689e40010f106526411d2f15
author Jerry Zhang <zhangjerry@google.com> 1522101579 -0700
committer Jerry Zhang <zhangjerry@google.com> 1522108893 +0000

Guard against null server

If MtpService stops before MtpServer
shuts down, the server will be null,
so don't attempt to use it in that
case.

Bug: 76433619
Test: no errors
Change-Id: I6744cb78908e6a0663a4b60107d5c9c18dda62bb