kern/105346: fcntl(): prevent useless locking with F_DUPFD

[Ed Schouten]

Hello,

I've just updated the patch to apply on the latest CURRENT again. Jeff
did some improvements to the kern_fcntl() routine to push down the usage
of Giant even further, which caused the layout of the routine to change.

The patch is now more compact and more readable.

-- 
 Ed Schouten <ed at fxq.nl>
 WWW: http://g-rave.nl/
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