No, and that’s quite the opposite: this is the best, most natural and healthiest way to bring SEO juice to your site and your client’s. This is the honest way to grow your SEO: you tell people who made the website, and you direct people to it from your site. This is how Googles SEO works: counting the links back to a site and determining if those links are made in an honest way.
It’s not negative, it’s the best practice.