The Knicks are “unhappy’’ about a change in the terms of the Rockets’ offer sheet for Jeremy Lin, according to an NBA source, after the offer was bumped to $25 million guaranteed over three years, Lin went to Las Vegas yesterday to meet with the Rockets to renegotiate the offer sheet and never told the Knicks he was coming to town, The Post has learned. .... Rockets general manager Daryl Morey stuck it to the Knicks, too, as the ramped-up offer sheet calls for a bump in the third year of the contract to $14.9 million from the previously offered $9.3 million. Source: http://www.iamagm.com/article/rocke...emy-lin-offer-sheet-knicks-angry#.UAGHw9uF9gw