[S390] vmemmap: fix off-by-one bug.
If a memory range is supposed to be added to the 1:1 mapping and it ends just below the maximum supported physical address it won't succeed. This is because a test doesn't consider that the end address is 1 smaller than start + size. Fix the comparison. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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