lib/ubsan.c: mark type_check_kinds with static keyword

Fix the following sparse warning:

  lib/ubsan.c:20:12: warning: symbol 'type_check_kinds' was not declared. Should it be static?

[akpm@linux-foundation.org: make it `static const char * const' while we're in there]

Link: https://lkml.kernel.org/r/1607602638-79584-1-git-send-email-zou_wei@huawei.com
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/ubsan.c

@@ -17,7 +17,7 @@
 
 #include "ubsan.h"
 
-const char *type_check_kinds[] = {
+static const char * const type_check_kinds[] = {
 	"load of",
 	"store to",
 	"reference binding to",