Apply Clippy suggestions (#15549)

While working on other PRs, I noticed that Clippy had some suggestions
(warnings). This PR fixes those warnings.

crates/oxide/src/cursor.rs

@@ -67,7 +67,7 @@ impl<'a> Cursor<'a> {
     }
 }
 
-impl<'a> Display for Cursor<'a> {
+impl Display for Cursor<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let len = self.input.len().to_string();
 

crates/oxide/src/parser.rs

@@ -204,7 +204,7 @@ impl<'a> Extractor<'a> {
     }
 
     #[inline(always)]
-    fn split_candidate(candidate: &'a [u8]) -> SplitCandidate {
+    fn split_candidate(candidate: &'a [u8]) -> SplitCandidate<'a> {
         let mut brackets = 0;
         let mut idx_end = 0;
 

crates/oxide/src/scanner/detect_sources.rs

@@ -95,13 +95,8 @@ impl DetectSources {
             )
             .into_iter();
 
-        loop {
-            // We are only interested in valid entries
-            let entry = match it.next() {
-                Some(Ok(entry)) => entry,
-                _ => break,
-            };
-
+        // We are only interested in valid entries
+        while let Some(Ok(entry)) = it.next() {
             // Ignore known directories that we don't want to traverse into.
             if entry.file_type().is_dir() && entry.file_name() == ".git" {
                 it.skip_current_dir();