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/fpu/mul-subnormal-single-1.c b/post/lib_powerpc/fpu/mul-subnormal-single-1.c
index 23a3f30..b3f8deb 100644
--- a/post/lib_powerpc/fpu/mul-subnormal-single-1.c
+++ b/post/lib_powerpc/fpu/mul-subnormal-single-1.c
@@ -86,7 +86,7 @@
 {
 	unsigned int i;
 
-	for (i = 0; i < sizeof (expected) / sizeof (expected[0]); i++)
+	for (i = 0; i < ARRAY_SIZE(expected); i++)
 	{
 		tstmul (expected[i].p1, expected[i].p2, expected[i].res);
 		tstmul (expected[i].p2, expected[i].p1, expected[i].res);