der(clippy): fix uint <-> int conversion safety

der/src/asn1/integer/int.rs

@@ -31,7 +31,7 @@ macro_rules! impl_encoding_traits {
                     let bytes = reader.read_into(&mut buf[..max_length])?;
 
                     let result = if is_highest_bit_set(bytes) {
-                        <$uint>::from_be_bytes(decode_to_array(bytes)?) as $int
+                        <$int>::try_from(<$uint>::from_be_bytes(decode_to_array(bytes)?))?
                     } else {
                         Self::from_be_bytes(uint::decode_to_array(bytes)?)
                     };
@@ -48,15 +48,15 @@ macro_rules! impl_encoding_traits {
             impl EncodeValue for $int {
                 fn value_len(&self) -> Result<Length> {
                     if *self < 0 {
-                        negative_encoded_len(&(*self as $uint).to_be_bytes())
+                        negative_encoded_len(&(<$uint>::try_from(*self)?).to_be_bytes())
                     } else {
                         uint::encoded_len(&self.to_be_bytes())
                     }
                 }
 
                 fn encode_value(&self, writer: &mut impl Writer) -> Result<()> {
                     if *self < 0 {
-                        encode_bytes(writer, &(*self as $uint).to_be_bytes())
+                        encode_bytes(writer, &(<$uint>::try_from(*self)?).to_be_bytes())
                     } else {
                         uint::encode_bytes(writer, &self.to_be_bytes())
                     }