drm: Fix GETCONNECTOR regression

In

commit 91eefc05f0ac71902906b2058360e61bd25137fe
Author: Daniel Vetter <[email protected]>
Date:   Wed Dec 14 00:08:10 2016 +0100

    drm: Tighten locking in drm_mode_getconnector

I reordered the logic a bit in that IOCTL, but that broke userspace
since it'll get the new mode list, but not the new property values.
Fix that again.

v2: Fix up the error path handling when copy_to_user for the modes
failes (Dhinakaran).

Fixes: 91eefc05f0ac ("drm: Tighten locking in drm_mode_getconnector")
Cc: Sean Paul <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: David Airlie <[email protected]>
Cc: [email protected]
Reported-by: "H.J. Lu" <[email protected]>
Tested-by: "H.J. Lu" <[email protected]>
Cc: <[email protected]> # v4.11+
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100576
Cc: "H.J. Lu" <[email protected]>
Cc: "Pandiyan, Dhinakaran" <[email protected]>
Reviewed-by: Sean Paul <[email protected]>
Reviewed-by: Dhinakaran Pandiyan <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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