Simplify expression of the PH hash function.

src/ph.c

@@ -104,12 +104,12 @@ hash(const struct hash * const restrict hash,
 	assert((len >> 2) <= hash->l);
 
 	for (e = s + l; s < e; k += 2, s += 2)
-		h += (*s + *k) * (*(s+1) + *(k+1));
+		h += (s[0] + k[0]) * (s[1] + k[1]);
 
 	/* When the subject length is not an exact multiple of 8. */
 	if ((len & 0x07) != 0) {
 		memcpy(tail, e, (void *)(subject + len) - (void *)e);
-		h += (*tail + *k) * (*(tail+1) + *(k+1));
+		h += (tail[0] + k[0]) * (tail[1] + k[1]);
 	}
 
 	return ((h >> 32) & hash->mask);