gpu_info_util: Close X11 display after usage This ensures that the X11 display connection won't leak if GetNvidiaDriverVersionWithXNVCtrl gets called multiple times. Bug: angleproject:8294 Change-Id: Id9fe8e6b6d5524965c1638841af88416fe28c76a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4749333 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>