Fix clippy warnings

src/link/reader.rs

@@ -89,7 +89,7 @@ impl MessageReader {
                 self.length_buffer[self.read_bytes] = input;
                 self.read_bytes += 1;
                 if self.read_bytes >= UE_RECEIVED_FIELD_SIZE {
-                    self.ue_received_bytes += array_of_u8_to_u16(self.length_buffer) as u64;
+                    self.ue_received_bytes += u64::from(array_of_u8_to_u16(self.length_buffer));
                     self.change_state(ReadingState::Head);
                 }
             }