wined3d: remove an unused variable

[Austin English]

-- 
-Austin
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diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index ed047f2..74bb3c0 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -4199,7 +4199,6 @@ static void read_from_framebuffer(struct wined3d_surface *surface, const RECT *r
 static void read_from_framebuffer_texture(struct wined3d_surface *surface, BOOL srgb)
 {
     struct wined3d_device *device = surface->resource.device;
-    const struct wined3d_gl_info *gl_info;
     struct wined3d_context *context;
 
     if (!surface_is_offscreen(surface))
@@ -4216,7 +4215,6 @@ static void read_from_framebuffer_texture(struct wined3d_surface *surface, BOOL
      * states in the stateblock, and no driver was found yet that had bugs in that regard.
      */
     context = context_acquire(device, surface);
-    gl_info = context->gl_info;
     device_invalidate_state(device, STATE_FRAMEBUFFER);
 
     surface_prepare_texture(surface, context, srgb);