Share_diff should not be converting the work data to hex.

cgminer.c

@@ -1974,16 +1974,12 @@ share_result(json_t *val, json_t *res, json_t *err, const struct work *work,
 static uint64_t share_diff(const struct work *work)
 {
 	const uint64_t h64 = 0xFFFF000000000000ull;
-	char rtarget[33], *target;
 	uint64_t *data64, d64;
+	char rhash[33];
 	uint64_t ret;
 
-	target = bin2hex(work->hash, 32);
-	if (unlikely(!target))
-		quit(1, "Failed to bin2hex in share_diff");
-	swab256(rtarget, target);
-	free(target);
-	data64 = (uint64_t *)(rtarget + 4);
+	swab256(rhash, work->hash);
+	data64 = (uint64_t *)(rhash + 4);
 	d64 = be64toh(*data64);
 	if (unlikely(!d64))
 		d64 = 1;