x86/kaslr: Fix off-by-one error in process_gb_huge_pages()

If the remaining size of the region is exactly 1Gb, there is still one
hugepage that can be reserved.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200728225722.67457-11-nivedita@alum.mit.edu

arch/x86/boot/compressed/kaslr.c

@@ -562,7 +562,7 @@ process_gb_huge_pages(struct mem_vector *region, unsigned long image_size)
 		size = region->size - (addr - region->start);
 
 	/* Check how many 1GB huge pages can be filtered out: */
-	while (size > PUD_SIZE && max_gb_huge_pages) {
+	while (size >= PUD_SIZE && max_gb_huge_pages) {
 		size -= PUD_SIZE;
 		max_gb_huge_pages--;
 		i++;