Kelvin Benjamin

Bills Hall of Famer Andre Reed is siding with Cam Newton in his spat with Buffalo WR Kelvin Benjamin ... telling TMZ Sports, K.B. needs to end the fight and focus on the season!! Cam and Kelvin nearly came to blows before their preseason game Thursday when Newton confronted Benjamin about calling…

Kelvin Benjamin just brushed off Cam Newton like a defensive back ... leaving Cam hanging on a high five and exchanging heated words with the QB -- and it's all on video. Remember ... the Bills wideout blasted Cam in the media this week -- essentially blaming Newton for all of his struggles in…