Add a call to pthread_attr_destroy to avoid potential memory leaks.

Change-Id: Ib57efc3530e9793298190cc9cab19c9af54e11a7
diff --git a/libs/utils/Threads.cpp b/libs/utils/Threads.cpp
index 6d5067b..02c380b 100644
--- a/libs/utils/Threads.cpp
+++ b/libs/utils/Threads.cpp
@@ -161,6 +161,7 @@
     pthread_t thread;
     int result = pthread_create(&thread, &attr,
                     (android_pthread_entry)entryFunction, userData);
+    pthread_attr_destroy(&attr);
     if (result != 0) {
         LOGE("androidCreateRawThreadEtc failed (entry=%p, res=%d, errno=%d)\n"
              "(android threadPriority=%d)",