EGL: Fix error for eglCreateWindowSurface

The EGL 1.4 spec section 3.5.1 states that EGL_BAD_ALLOC should be set
if the supplied window already has an associated EGLSurface, not
EGL_BAD_NATIVE_WINDOW as is currently set.

Change-Id: If1598617f4e31904f2045560ae1cdf49d8a697dc
diff --git a/opengl/libs/EGL/eglApi.cpp b/opengl/libs/EGL/eglApi.cpp
index c25612d..d1f7c57 100644
--- a/opengl/libs/EGL/eglApi.cpp
+++ b/opengl/libs/EGL/eglApi.cpp
@@ -295,7 +295,7 @@
         if (native_window_api_connect(window, NATIVE_WINDOW_API_EGL) != OK) {
             ALOGE("EGLNativeWindowType %p already connected to another API",
-            return setError(EGL_BAD_NATIVE_WINDOW, EGL_NO_SURFACE);
+            return setError(EGL_BAD_ALLOC, EGL_NO_SURFACE);
         // set the native window's buffers format to match this config