UPSTREAM: drm: plug memory leak on drm_setup() failure

Currently we fail to free and detach the drm_file when drm_setup() fails.
Use the drm_close_helper to do address that.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190114084410.15266-2-emil.l.velikov@gmail.com


(cherry picked from commit 4acc5be3cd89cc4132d8456144ee066905a58e41)
Bug: 152417756
Signed-off-by: Alistair Delva <adelva@google.com>
Change-Id: Ie9af860c8fae31812b7276f779e0bd9951a944b4