Referee Felix Zwayer has confirmed that goal-line technology malfunctioned in the Bundesliga match between Mainz and Arminia Bielefeld on Saturday. The official indicated his watch had shown the ball was over the line after a header by Mainz’s Moussa Niakhaté. But the video assistant referee saw that the ball was clearly not over the line and the goal was chalked off. “The provider has to deal with this. We heard that the system was checked during the course of the game and that there was indeed a malfunction,” Zwayer told reporters. The referee even went to the pitchside monitor to check. Goa…