Readability improvement

Author: facutuesca

openssl/src/pkey_ctx.rs

@@ -743,7 +743,7 @@ impl<T> PkeyCtxRef<T> {
     #[cfg(ossl320)]
     #[corresponds(EVP_PKEY_CTX_set_params)]
     pub fn set_nonce_type(&mut self, nonce_type: NonceType) -> Result<(), ErrorStack> {
-        let nonce_field_name = CStr::from_bytes_with_nul("nonce-type\0".as_bytes()).unwrap();
+        let nonce_field_name = CStr::from_bytes_with_nul(b"nonce-type\0").unwrap();
         let mut nonce_type = nonce_type.0;
         unsafe {
             let param_nonce =
@@ -765,7 +765,7 @@ impl<T> PkeyCtxRef<T> {
     #[cfg(ossl320)]
     #[corresponds(EVP_PKEY_CTX_get_params)]
     pub fn nonce_type(&mut self) -> Result<NonceType, ErrorStack> {
-        let nonce_field_name = CStr::from_bytes_with_nul("nonce-type\0".as_bytes()).unwrap();
+        let nonce_field_name = CStr::from_bytes_with_nul(b"nonce-type\0").unwrap();
         let mut nonce_type: c_uint = 0;
         unsafe {
             let param_nonce =