x86/kaslr: Return boolean values from a function returning bool

Fix the following coccicheck warnings:

  ./arch/x86/boot/compressed/kaslr.c:642:10-11: WARNING: return of 0/1 in
  function 'process_mem_region' with return type bool.
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NJiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/1615283963-67277-1-git-send-email-jiapeng.chong@linux.alibaba.com

arch/x86/boot/compressed/kaslr.c

@@ -639,9 +639,9 @@ static bool process_mem_region(struct mem_vector *region,
 
 		if (slot_area_index == MAX_SLOT_AREA) {
 			debug_putstr("Aborted e820/efi memmap scan (slot_areas full)!\n");
-			return 1;
+			return true;
 		}
-		return 0;
+		return false;
 	}
 
 #if defined(CONFIG_MEMORY_HOTREMOVE) && defined(CONFIG_ACPI)