fixes set_port

Author: chanced

url/src/lib.rs

@@ -1770,7 +1770,7 @@ impl Url {
     pub fn set_port(&mut self, mut port: Option<u16>) -> Result<(), ()> {
         // has_host implies !cannot_be_a_base
         if !self.has_host() || self.host() == Some(Host::Domain("")) || self.scheme() == "file" {
-            if port.is_some() {
+            if port.is_none() {
                 return Ok(());
             }
             return Err(());