A man has died after a stabbing in Sydney's west.Emergency services were called to Clouta Place, Emu Plains at 6.45pm today.Videos posted to social media showed more than a dozen police cars, ambulances and the police helicopter responding to the incident.NSW Police said officers found a man, believed to be in his 50s, with multiple stab wounds to his upper body.He was treated by NSW Ambulance paramedics but died at the scene.A 31-year-old man was arrested at the scene and