The isolated range is [*@start_rgn, *@end_rgn - 1], while the comment says
"the end region inside the range" is *@end_rgn.

Let's correct it.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Link: https://lore.kernel.org/r/20240507075833.6346-4-richard.weiyang@gmail.comSigned-off-by: Mike Rapoport (IBM) <rppt@kernel.org>