Fix some clippy warnings

src/main.rs

@@ -150,7 +150,7 @@ fn main() {
         exclude_patterns: matches
             .values_of("exclude")
             .map(|v| v.map(|p| String::from("!") + p).collect())
-            .unwrap_or(vec![]),
+            .unwrap_or_else(|| vec![]),
     };
 
     match RegexBuilder::new(pattern)

src/walk.rs

@@ -51,7 +51,7 @@ pub fn scan(root: &Path, pattern: Arc<Regex>, config: Arc<FdOptions>) {
 
     let mut override_builder = OverrideBuilder::new(root);
 
-    for pattern in config.exclude_patterns.iter() {
+    for pattern in &config.exclude_patterns {
         let res = override_builder.add(pattern);
         if res.is_err() {
             error(&format!("Error: malformed exclude pattern '{}'", pattern));

tests/tests.rs

@@ -469,7 +469,7 @@ fn test_symlink() {
     let parent_parent = if cfg!(windows) { ".." } else { "../.." };
     te.assert_output_subdirectory(
         "symlink",
-        &["", &parent_parent],
+        &["", parent_parent],
         &format!(
             "{dir}/a.foo
             {dir}/e1 e2