st/egl: Remove buffer from screen

It is no longer needed since the new drm api code,
	and it incorrectly checked if the buffer where there
	for testing completeness when it should have checked
	the texture instead.

src/gallium/state_trackers/egl/egl_surface.c

@@ -152,7 +152,6 @@ drm_takedown_shown_screen(_EGLDisplay *dpy, struct drm_screen *screen)
 
 	pipe_surface_reference(&screen->surface, NULL);
 	pipe_texture_reference(&screen->tex, NULL);
-	pipe_buffer_reference(&screen->buffer, NULL);
 
 	screen->shown = 0;
 }
@@ -250,8 +249,8 @@ drm_show_screen_surface_mesa(_EGLDriver *drv, _EGLDisplay *dpy,
 
 
 	drm_create_texture(dpy, scrn, mode->Width, mode->Height);
-	if (!scrn->buffer)
-		return EGL_FALSE;
+	if (!scrn->tex)
+		goto err_tex;
 
 	ret = drmModeAddFB(dev->drmFD,
 	                   scrn->front.width, scrn->front.height,
@@ -325,8 +324,8 @@ err_fb:
 err_bo:
 	pipe_surface_reference(&scrn->surface, NULL);
 	pipe_texture_reference(&scrn->tex, NULL);
-	pipe_buffer_reference(&scrn->buffer, NULL);
 
+err_tex:
 	return EGL_FALSE;
 }
 

src/gallium/state_trackers/egl/egl_tracker.h

@@ -94,7 +94,6 @@ struct drm_screen
 	 * pipe
 	 */
 
-	struct pipe_buffer *buffer;
 	struct pipe_texture *tex;
 	struct pipe_surface *surface;