Warriors center Andrew Bogut didn’t fly with the team from Oakland as it started its final extended road trip of the season Saturday because of a disc protrusion that is causing back spasms, according to team officials. The 7-foot, 260-pounder played only 12 of the team’s first 54 games because of left ankle surgery and missed Friday’s overtime win against NBA-leading San Antonio after his back started acting up. He missed 43 games with a stress fracture in his lower back in 2008-09, a game in 2009-10 with a mid-back strain and five games in 2010-11 with a sore back. The Warriors say there is no real timetable for Bogut’s return, but they’re holding out hope that he can join the team at some point during their five-game trip.