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: Abaci Robot <[e-mail]>
Signed-off-by: Jiapeng Chong <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]

arch/x86/boot/compressed/kaslr.c

···
 
 		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)