Fix uninitialized variable when creating LayerCreationArgs

Test: SurfaceFlinger_test.MirrorLayerTest#MirrorBufferLayer
Fixes: 148143913
Change-Id: I21929a0408bd4b37d5d6eb0898d2c8e96ef6f694
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index ffe004f..6c07353 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -78,11 +78,11 @@
 // ---------------------------------------------------------------------------
 
 struct LayerCreationArgs {
-    LayerCreationArgs(SurfaceFlinger* flinger, const sp<Client>& client, std::string name,
+    LayerCreationArgs(SurfaceFlinger* flinger, const sp<Client> client, std::string name,
                       uint32_t w, uint32_t h, uint32_t flags, LayerMetadata metadata);
 
     SurfaceFlinger* flinger;
-    const sp<Client>& client;
+    const sp<Client> client;
     std::string name;
     uint32_t w;
     uint32_t h;