DATAREDIS-1195 - Polishing.

Simplify Expiration.from(…) construction.

Original pull request: #553.

Author: mp911de

src/main/java/org/springframework/data/redis/cache/DefaultRedisCacheWriter.java

@@ -130,8 +130,9 @@ public byte[] putIfAbsent(String name, byte[] key, byte[] value, @Nullable Durat
 			try {
 
 				boolean put;
+
 				if (shouldExpireWithin(ttl)) {
-					put = connection.set(key, value, Expiration.milliseconds(ttl.toMillis()), SetOption.ifAbsent());
+					put = connection.set(key, value, Expiration.from(ttl), SetOption.ifAbsent());
 				} else {
 					put = connection.setNX(key, value);
 				}