What I anticipated to be a concert full of unfamiliar fans — myself included (though I hate to admit it) — ended up being quite the opposite. “Brazil” singer Declan McKenna made his final stop on the U.S. leg of his “Zeroes” tour this past Thursday at Warehouse Live here in Houston. The night began with confused fans packed into a separate part of the venue because “soundcheck was taking longer than expected,” and concluded with fans cheering as McKenna completely demolished his guitar on stage during the final song in his set, “British Bombs.”