adb: make darwin build with thread safety analysis.

Test: mma on darwin
Change-Id: I44dfc53fc381e60de83f3bc503691cdb8179ca91
diff --git a/adb/client/usb_osx.cpp b/adb/client/usb_osx.cpp
index e4a543b..e366754 100644
--- a/adb/client/usb_osx.cpp
+++ b/adb/client/usb_osx.cpp
@@ -38,6 +38,7 @@
 
 #include <android-base/logging.h>
 #include <android-base/stringprintf.h>
+#include <android-base/thread_annotations.h>
 
 #include "adb.h"
 #include "transport.h"
@@ -429,7 +430,7 @@
     VLOG(USB) << "RunLoopThread done";
 }
 
-static void usb_cleanup() {
+static void usb_cleanup() NO_THREAD_SAFETY_ANALYSIS {
     VLOG(USB) << "usb_cleanup";
     // Wait until usb operations in RunLoopThread finish, and prevent further operations.
     operate_device_lock.lock();