egl: remove unused err variable

Fixes: 81e95924ea1 ("egl: call _eglError within _eglParseImageAttribList")

Reviewed-by: Daniel Stone <daniels@collabora.com>
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 2392bfb..5bf36bf 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -1910,7 +1910,7 @@
                                   EGLClientBuffer buffer, const EGLint *attr_list)
 {
    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
-   EGLint format, name, pitch, err;
+   EGLint format, name, pitch;
    _EGLImageAttribs attrs;
    __DRIimage *dri_image;