simplify disksort, please review.

[Poul-Henning Kamp]

In message <20050613220757.1063996b.antoine.brodin at laposte.net>, Antoine Brodin
 writes:

>bioq_insert_head and bioq_insert_tail should perhaps be modified when
>they're called from outside of subr_disk.c too, to insert just before
>insert_point and replace it in the head case... but this probably
>affects sorting of later bios...

I think that would be a pointless complication of the code...

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