mm/kmemleak.c: remove obsolete simple_strtoul

Replace the obsolete simple_strtoul() with kstrtoul().
Signed-off-by: Abhijit Pawar <abhi.c.pawar@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/kmemleak.c

@@ -1556,7 +1556,8 @@ static int dump_str_object_info(const char *str)
 	struct kmemleak_object *object;
 	unsigned long addr;
 
-	addr= simple_strtoul(str, NULL, 0);
+	if (kstrtoul(str, 0, &addr))
+		return -EINVAL;
 	object = find_and_get_object(addr, 0);
 	if (!object) {
 		pr_info("Unknown object at 0x%08lx\n", addr);