At 14:51 of the first period in the Penguins/Predators game, Pittsburgh requested a Coach's Challenge to review whether a Nashville player interfered with Penguins goaltender Matt Murray prior to Calle Jarnkrok's goal.
After reviewing all available replays and consulting with NHL Hockey Operations staff, the Referee confirmed no goaltender interference infractions occurred.

Therefore the original call stands - good goal Nashville Predators.
Since the Coach's Challenge did not result in the original call being overturned, the Pittsburgh Penguins forfeit their time-out.