libdelimit: formatting & correctness

src/libdelimit.rs

@@ -56,15 +56,12 @@ impl<T> Iterator for Delimited<T> where T: Read {
 
             match self.stream.read(&mut buf) {
                 Ok(0) => {
-                    if self.buffer.is_empty() {
-                        return None;
-                    }
+                    let _ = self.buffer.is_empty() && return None;
 
                     return Some(Ok(mem::take(&mut self.buffer)));
                 },
                 Ok(n) => {
-                    let content = &buf[..n];
-                    self.buffer.extend_from_slice(&content);
+                    self.buffer.extend_from_slice(&buf[..n]);
                 },
                 Err(e) => {
                     return Some(Err(e));
@@ -78,9 +75,11 @@ fn find_subslice(stack: &[u8], key: &[u8]) -> Option<usize> {
     if key.len() == 1 {
         return stack.iter().position(|&b| b == key[0]);
     }
+
     if key.len() > stack.len() {
         return None;
     }
+
     for i in 0..=stack.len() - key.len() {
         if &stack[i..i + key.len()] == key {
             return Some(i);