Merge branch 'thread-state-to-null-in-teardown' into 'master'

Set current thread state to NULL in teardown

See merge request glvnd/libglvnd!264

src/EGL/libeglcurrent.c

@@ -91,6 +91,7 @@ void __eglCurrentTeardown(EGLBoolean doReset)
         __eglDestroyAPIState(apiState);
     }
 
+    __glvndPthreadFuncs.setspecific(threadStateKey, NULL);
     while (!glvnd_list_is_empty(&currentThreadStateList)) {
         __EGLThreadAPIState *threadState = glvnd_list_first_entry(
                 &currentThreadStateList, __EGLThreadAPIState, entry);