lib/wind: find_normalize read past end of array

find_normalize() can under some circumstances read one element
beyond the input array.  The contents are discarded immediately
without further use.

This change prevents the unintended read.

Change-Id: Ia2759a5632d64f7fa6553f879b5bbbf43ba3513e

lib/wind/normalize.c

@@ -227,9 +227,9 @@ find_composition(const uint32_t *in, unsigned in_len)
 	unsigned i;
 
 	if (n % 5 == 0) {
-	    cur = *in++;
 	    if (in_len-- == 0)
 		return c->val;
+	    cur = *in++;
 	}
 
 	i = cur >> 16;