Bulls guard Coby White battling with frustration after latest setback

Bulls guard Coby White is doing his best to deal with yet another calf injury, trying to find the positives out of it.Paul Beaty/AP

Coby White is trying to keep a positive face.

It’s been tested a lot lately, but the Bulls guard insisted on Friday that he’s winning the inner battle.

“It’s very frustrating just because you think you’re past something, and then it hops back up again,” White said.

And too often this season it feels like it won’t hop off.

White’s calf issues began in August when he strained the right one and was set back for months. After missing all of training camp and the first 11 regular-season games, he finally made his debut on Nov. 16 – minutes restrictions and all – but…