fix clippy errors

These must have popped up with a new version of Rust since last commits.

src/client/mod.rs

@@ -1614,7 +1614,7 @@ impl Session<Described> {
                     "Connecting via TCP to known-broken RTSP server {:?}. \
                         See <https://github.com/scottlamb/retina/issues/17>. \
                         Consider using UDP instead!",
-                    &*t
+                    t
                 );
             }
         }

src/codec/aac.rs

@@ -196,7 +196,7 @@ fn set_length(len: usize, data: &mut [u8]) -> Result<usize, String> {
         Ok(4)
     } else {
         // BaseDescriptor sets a maximum length of 2**28 - 1.
-        return Err(format!("length {} too long", len));
+        Err(format!("length {} too long", len))
     }
 }