wm8750: Fix calculation of number of array elements

Coverity says that the division by sizeof(*s->rate) might be wrong.
I think that coverity is right.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
diff --git a/hw/wm8750.c b/hw/wm8750.c
index 39383f4..9fbdf3d 100644
--- a/hw/wm8750.c
+++ b/hw/wm8750.c
@@ -563,7 +563,7 @@
 {
     WM8750State *s = opaque;
 
-    s->rate_vmstate = (s->rate - wm_rate_table) / sizeof(*s->rate);
+    s->rate_vmstate = s->rate - wm_rate_table;
 }
 
 static int wm8750_post_load(void *opaque, int version_id)