Fix IoRead's raw buffering on invalid utf-8 as well

Author: dtolnay

src/read.rs

@@ -377,7 +377,10 @@ where
  V: Visitor<'de>,
  {
  let raw = self.raw_buffer.take().unwrap();
- let raw = String::from_utf8(raw).unwrap();
+ let raw = match String::from_utf8(raw) {
+ Ok(raw) => raw,
+ Err(_) => return error(self, ErrorCode::InvalidUnicodeCodePoint),
+ };
  visitor.visit_map(OwnedRawDeserializer {
  raw_value: Some(raw),
  })