removed mutability of test variable that is not needed.

src/networking/ip.rs

@@ -163,7 +163,7 @@ mod tests {
     // an IPv4 Address
     fn arr_to_ipaddr() {
         use super::*;
-        let mut ip_addr: [u8; 4] = [127, 0, 0, 1];
+        let ip_addr: [u8; 4] = [127, 0, 0, 1];
         assert_eq!(IpAddr::from_arr(&ip_addr).unwrap(), IpAddr::V4(127, 0, 0, 1));
     }
 }