Fix Coverity uninitialized pointer field Thread.h

Tharazi97 · Tharazi97 · commit b1ced1bb5b0b · 2019-08-21T10:48:17.000+02:00
Changed _obj_mem to be initialized with creating new thread.
diff --git a/rtos/Thread.h b/rtos/Thread.h
@@ -540,7 +540,7 @@ class Thread : private mbed::NonCopyable<Thread> {
     bool                       _dynamic_stack;
     Semaphore                  _join_sem;
     mutable Mutex              _mutex;
-    mbed_rtos_storage_thread_t _obj_mem;
+    mbed_rtos_storage_thread_t _obj_mem = {};
     bool                       _finished;
 };
 /** @}*/
