x86/NUMA: correct off-by-1 in node map population

x86/NUMA: correct off-by-1 in node map population

As it turns out populate_memnodemap() so far "relied" on
extract_lsb_from_nodes() setting memnodemapsize one too high in edge
cases. Correct the issue there as well, by changing "epdx" to be an
inclusive PDX and adjusting the respective relational operators.

While there also limit the scope of both related variables.

Fixes: b1f4b45d02ca ("x86/NUMA: correct off-by-1 in node map size calculation")
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Release-acked-by: Henry Wang <Henry.Wang@arm.com>