clippy fixes

Author: kelvich

postgres-protocol/src/authentication/sasl.rs

@@ -389,7 +389,7 @@ impl<'a> Parser<'a> {
     }
 
     fn posit_number(&mut self) -> io::Result<u32> {
-        let n = self.take_while(|c| matches!(c, '0'..='9'))?;
+        let n = self.take_while(|c| c.is_ascii_digit())?;
         n.parse()
             .map_err(|e| io::Error::new(io::ErrorKind::InvalidInput, e))
     }

postgres-protocol/src/message/backend.rs

@@ -707,7 +707,7 @@ impl<'a> FallibleIterator for DataRowRanges<'a> {
                 ));
             }
             let base = self.len - self.buf.len();
-            self.buf = &self.buf[len as usize..];
+            self.buf = &self.buf[len..];
             Ok(Some(Some(base..base + len)))
         }
     }