dbx crashes system

[Chris Torek]

Find calls to munhash() and mfind() that cast the second
argument, c->c_blkno, to `(daddr_t)(u_long)'.  There are two,
one in /sys/sys/vm_mem.c and one in /sys/vax/vm_machdep.c.
Remove the (daddr_t).  The new code is technically wrong,
but makes the compiler do the right thing.

`Fixed in 4.3!'
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 1516)
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