fix some clippy warnings

Author: dwrensha

capnp/src/serialize.rs

@@ -339,11 +339,7 @@ where
 
     let segment_count = u32::from_le_bytes(buf[0..4].try_into().unwrap()).wrapping_add(1) as usize;
 
-    if segment_count >= SEGMENTS_COUNT_LIMIT {
-        return Err(Error::from_kind(ErrorKind::InvalidNumberOfSegments(
-            segment_count,
-        )));
-    } else if segment_count == 0 {
+    if segment_count >= SEGMENTS_COUNT_LIMIT || segment_count == 0 {
         return Err(Error::from_kind(ErrorKind::InvalidNumberOfSegments(
             segment_count,
         )));

capnp/src/text.rs

@@ -174,12 +174,12 @@ impl<'a> Builder<'a> {
     }
 
     pub fn as_bytes(self) -> &'a [u8] {
-        &self.bytes[..]
+        self.bytes
     }
 
     /// Converts to a `str`, returning a error if the data contains invalid utf-8.
     pub fn to_str(self) -> core::result::Result<&'a str, core::str::Utf8Error> {
-        str::from_utf8(&self.bytes[..])
+        str::from_utf8(self.bytes)
     }
 
     #[cfg(feature = "alloc")]