segment wrap around bug

[Nathan Sidwell]

this patch fixes a SECTION_IN_SEGMENT check that was failing for a segment right 
at the end of memory.  I've rearranged the maths to avoid integer wrapping.

tested on powerpc-wrs-vxworks

ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery

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