[PATCH] fix off-by-one in mem_init()

[Dave Hansen]

lmb_end_of_DRAM() returns the address of the end of RAM, not the
starting address of the last page.  We've been accessing mem_map[] out
of bounds for quite a while.  But, it's just a read, so it's probably
never caused a real problem.

But, during my port of CONFIG_NONLINEAR to ppc64, I have a check to make
sure that all __va() calls are given with valid physical addresses.
This code tripped that check.

-- Dave
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