Fix usage before assignment

When new connection is created in doGetAsyncDedicatedConnection(), it is
not yet assigned to asyncDedicatedConnection attribute, so it cannot be
used in potentiallySelectDatabase() call. Fix this by passing the
connection to the method.

Closes spring-projects#2984

Signed-off-by: Oldřich Jedlička <oldium.pro@gmail.com>

src/main/java/org/springframework/data/redis/connection/lettuce/LettuceConnection.java

@@ -512,7 +512,7 @@ private void reset() {
 		if (this.asyncDedicatedConnection != null) {
 			try {
 				if (customizedDatabaseIndex()) {
-					potentiallySelectDatabase(this.defaultDbIndex);
+					potentiallySelectDatabase(this.asyncDedicatedConnection, this.defaultDbIndex);
 				}
 				this.connectionProvider.release(this.asyncDedicatedConnection);
 				this.asyncDedicatedConnection = null;
@@ -968,7 +968,7 @@ protected StatefulConnection<byte[], byte[]> doGetAsyncDedicatedConnection() {
 		StatefulConnection<byte[], byte[]> connection = getConnectionProvider().getConnection(StatefulConnection.class);
 
 		if (customizedDatabaseIndex()) {
-			potentiallySelectDatabase(this.dbIndex);
+			potentiallySelectDatabase(connection, this.dbIndex);
 		}
 
 		return connection;
@@ -1065,9 +1065,9 @@ private boolean customizedDatabaseIndex() {
 		return defaultDbIndex != dbIndex;
 	}
 
-	private void potentiallySelectDatabase(int dbIndex) {
+	private void potentiallySelectDatabase(StatefulConnection<byte[], byte[]> connection, int dbIndex) {
 
-		if (asyncDedicatedConnection instanceof StatefulRedisConnection<byte[], byte[]> statefulConnection) {
+		if (connection instanceof StatefulRedisConnection<byte[], byte[]> statefulConnection) {
 			statefulConnection.sync().select(dbIndex);
 		}
 	}