post: use ARRAY_SIZE

We've got a handy dandy macro already for calculating the number of
elements in an array, so use it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/post/lib_powerpc/load.c b/post/lib_powerpc/load.c
index 98d4373..49924f2 100644
--- a/post/lib_powerpc/load.c
+++ b/post/lib_powerpc/load.c
@@ -171,8 +171,7 @@
 	1
     },
 };
-static unsigned int cpu_post_load_size =
-    sizeof (cpu_post_load_table) / sizeof (struct cpu_post_load_s);
+static unsigned int cpu_post_load_size = ARRAY_SIZE(cpu_post_load_table);
 
 int cpu_post_test_load (void)
 {