CHICAGO—Kemba Walker scored 21 points, RJ Barrett added 20 and the New York Knicks hung on to hand the Chicago Bulls their first loss of the season, 104–103, on Thursday night. Julius Randle had 13 points, 16 rebound and nine assists. Derrick Rose came off New York’s bench to score 12 points against his former team as the Knicks won their second straight and improved to 4–1. This one wasn’t as easy for New York. It boiled down to a stop of Chicago’s DeMar DeRozan as time expired after Bulls went on a 12–0 run in the final minutes to nearly tie the score in a game the Knicks seemingly had wrapped up. “Right now, we’re still getting a feel for each other,” New York coach Tom Thibodeau said. “Every game we’re getting better and better. “I love the fact that everyone is sacrificing for the team and putting the …