Fix deadlock in cuttlefish/default implementation

Bug: 150830099

Test: atest LocationManagerFineTest#testRegisterGnssMeasurementsCallback
-c --iterations 100

Change-Id: I70aec19a481781d924ed3008765ca624a7eeb950
Merged-In: I70aec19a481781d924ed3008765ca624a7eeb950

(cherry picked from commit 3d652709ed40f8070c990bb275d3709d603d318e)
diff --git a/gnss/2.1/default/GnssAntennaInfo.cpp b/gnss/2.1/default/GnssAntennaInfo.cpp
index d32a0af..ed183a9 100644
--- a/gnss/2.1/default/GnssAntennaInfo.cpp
+++ b/gnss/2.1/default/GnssAntennaInfo.cpp
@@ -55,8 +55,8 @@
 
 Return<void> GnssAntennaInfo::close() {
     ALOGD("close");
-    std::unique_lock<std::mutex> lock(mMutex);
     stop();
+    std::unique_lock<std::mutex> lock(mMutex);
     sCallback = nullptr;
     return Void();
 }