Visualizer: do not use GNU old-style field designators

Avoiding the use of GCC extensions improves code
portability

Change-Id: Iabe9fc84d135160367922e6d026e8608475fe8c8
diff --git a/visualizer/offload_visualizer.c b/visualizer/offload_visualizer.c
index eb43558..2f2bb14 100644
--- a/visualizer/offload_visualizer.c
+++ b/visualizer/offload_visualizer.c
@@ -1231,11 +1231,11 @@
 
 __attribute__ ((visibility ("default")))
 audio_effect_library_t AUDIO_EFFECT_LIBRARY_INFO_SYM = {
-    tag : AUDIO_EFFECT_LIBRARY_TAG,
-    version : EFFECT_LIBRARY_API_VERSION,
-    name : "Visualizer Library",
-    implementor : "The Android Open Source Project",
-    create_effect : effect_lib_create,
-    release_effect : effect_lib_release,
-    get_descriptor : effect_lib_get_descriptor,
+    .tag = AUDIO_EFFECT_LIBRARY_TAG,
+    .version = EFFECT_LIBRARY_API_VERSION,
+    .name = "Visualizer Library",
+    .implementor = "The Android Open Source Project",
+    .create_effect = effect_lib_create,
+    .release_effect = effect_lib_release,
+    .get_descriptor = effect_lib_get_descriptor,
 };