Revert "drm: Don't pass negative delta to ktime_sub_ns()"

This reverts commit e91abf80a0998f326107874c88d549f94839f13c.

Since

commit 24e4a8c3e8868874835b0f1ad6dd417341e99822
Author: John Stultz <[email protected]>
Date:   Wed Jul 16 21:03:53 2014 +0000

    ktime: Kill non-scalar ktime_t implementation for 2038

there is no longer a 32bit version that's unsigned, and we don't have
to jump through ridiculous hoops to make the calculations correct.

I didn't look whether there's more of this pattern in the kernel.

Cc: John Stultz <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Michel Dänzer <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Dave Airlie <[email protected]>
Reviewed-by: Imre Deak <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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