x86/srat: fix the end pfn check in valid_numa_range()

x86/srat: fix the end pfn check in valid_numa_range()

... and fix the coding style on fly.

valid_numa_range(..., epfn << PAGE_SHIFT, ...) and its only caller
memory_add(..., epfn, pxm) interpret epfn inconsistently. The former
interprets epfn as the last pfn, while the latter interprets it as the
last pfn plus one. Fix this inconsistency in valid_numa_range(), since
most of other places use the latter interpretation.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>