core: asan: fix check_access()

Prior to this patch the for loop in check_access() that checks the
access in the shadow area is skipping accesses smaller than a ASAN block
(8 bytes). This patch fixes that problem and checks also smaller
accesses.

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

core/kernel/asan.c

@@ -182,8 +182,8 @@ static void check_access(vaddr_t addr, size_t size)
  if (!va_range_inside_shadow(begin, end))
  panic();
 
- e = va_to_shadow(end);
- for (a = va_to_shadow(begin); a != e; a++)
+ e = va_to_shadow((void *)(addr + size - 1));
+ for (a = va_to_shadow(begin); a <= e; a++)
  if (*a < 0)
  panic();