fix gofmt

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)

api/common.go

@@ -42,4 +42,3 @@ func MatchesContentType(contentType, expectedType string) bool {
 	}
 	return err == nil && mimetype == expectedType
 }
-