kdb: use ARRAY_SIZE where possible

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index a52493a..437b74d 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -124,7 +124,7 @@
 };
 #undef KDBMSG
 
-static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t);
+static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
 
 
 /*
@@ -175,7 +175,7 @@
  (char *)0,
 };
 
-static const int __nenv = (sizeof(__env) / sizeof(char *));
+static const int __nenv = ARRAY_SIZE(__env);
 
 struct task_struct *kdb_curr_task(int cpu)
 {