Fix format name typo

Change-Id: If7d86b74ad9735f12349d9fcb62b335f5a742bb5
diff --git a/libs/hwui/RenderBuffer.h b/libs/hwui/RenderBuffer.h
index a9ad3d7..35a516a 100644
--- a/libs/hwui/RenderBuffer.h
+++ b/libs/hwui/RenderBuffer.h
@@ -168,7 +168,7 @@
             case GL_DEPTH_COMPONENT16:
                 return "DEPTH_16";
             case GL_RGBA4:
-                return "RGBA_444";
+                return "RGBA_4444";
             case GL_RGB565:
                 return "RGB_565";
             case GL_RGB5_A1: