drm/i915: Only reset seqno if actually idle

Before we can reset the seqno, we have to be sure the engines are idle.
In debugfs/i915_drop_caches_set, we do wait_for_idle but allow ourselves
to be interrupted. We should only proceed to reset the seqno then if we
were not interrupted, and so also avoid overwriting the error status.

References: https://bugs.freedesktop.org/show_bug.cgi?id=108133
Fixes: 6b048706f407 ("drm/i915: Forcibly flush unwanted requests in drop-caches")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Reviewed-by: Joonas Lahtinen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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