liblog: add __android_log_config_*_close()

Add __android_log_config_read_close() and
__android_log_config_write_close().  Fortify the list macros
to detect for list corruption, looking for entries pointing
to themselves, deleted entries in list.

Test: gTest liblog-unit-tests
Bug: 27405083
Change-Id: I33e8a0cae7e202f1989ddd7c2a96752b44c8e746
diff --git a/liblog/config_write.c b/liblog/config_write.c
index d689f63..0aaaea6 100644
--- a/liblog/config_write.c
+++ b/liblog/config_write.c
@@ -64,3 +64,17 @@
     __android_log_add_transport(&__android_log_transport_write, &fakeLoggerWrite);
 #endif
 }
+
+LIBLOG_HIDDEN void __android_log_config_write_close() {
+    struct android_log_transport_write *transport;
+    struct listnode *n;
+
+    write_transport_for_each_safe(transport, n, &__android_log_transport_write) {
+        transport->logMask = 0;
+        list_remove(&transport->node);
+    }
+    write_transport_for_each_safe(transport, n, &__android_log_persist_write) {
+        transport->logMask = 0;
+        list_remove(&transport->node);
+    }
+}