drm: Remove duplicate "return" statement

Remove the duplicate "return" statement in drm_fb_helper_panic().

Signed-off-by: Lin Ming <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>

drivers/gpu/drm/drm_fb_helper.c

···
 {
 	printk(KERN_ERR "panic occurred, switching back to text console\n");
 	return drm_fb_helper_force_kernel_mode();
-	return 0;
 }
 EXPORT_SYMBOL(drm_fb_helper_panic);