Fix uninitialized variable when creating LayerCreationArgs

Test: SurfaceFlinger_test.MirrorLayerTest#MirrorBufferLayer
Fixes: 148143913
Change-Id: I21929a0408bd4b37d5d6eb0898d2c8e96ef6f694
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index f4d4329..2c219bf 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -144,7 +144,7 @@
     mFlinger->onLayerDestroyed(this);
 }
 
-LayerCreationArgs::LayerCreationArgs(SurfaceFlinger* flinger, const sp<Client>& client,
+LayerCreationArgs::LayerCreationArgs(SurfaceFlinger* flinger, const sp<Client> client,
                                      std::string name, uint32_t w, uint32_t h, uint32_t flags,
                                      LayerMetadata metadata)
       : flinger(flinger),