Fix map_unwrap_or lint

```
cargo clippy --workspace --exclude bindgen-integration --exclude tests_expectations -- -W clippy::map_unwrap_or
```

Author: nyurik

bindgen/clang.rs

@@ -1112,10 +1112,8 @@ impl Iterator for ClangTokenIterator<'_> {
 /// (including '_') and does not start with a digit.
 pub(crate) fn is_valid_identifier(name: &str) -> bool {
     let mut chars = name.chars();
-    let first_valid = chars
-        .next()
-        .map(|c| c.is_alphabetic() || c == '_')
-        .unwrap_or(false);
+    let first_valid =
+        chars.next().is_some_and(|c| c.is_alphabetic() || c == '_');
 
     first_valid && chars.all(|c| c.is_alphanumeric() || c == '_')
 }

bindgen/codegen/mod.rs

@@ -5145,14 +5145,10 @@ pub(crate) mod utils {
             return Ok(());
         }
 
-        let path = context
-            .options()
-            .wrap_static_fns_path
-            .as_ref()
-            .map(PathBuf::from)
-            .unwrap_or_else(|| {
-                std::env::temp_dir().join("bindgen").join("extern")
-            });
+        let path = context.options().wrap_static_fns_path.as_ref().map_or_else(
+            || std::env::temp_dir().join("bindgen").join("extern"),
+            PathBuf::from,
+        );
 
         let dir = path.parent().unwrap();
 

bindgen/codegen/serialize.rs

@@ -14,8 +14,7 @@ use super::{CodegenError, WrapAsVariadic};
 
 fn get_loc(item: &Item) -> String {
     item.location()
-        .map(|x| x.to_string())
-        .unwrap_or_else(|| "unknown".to_owned())
+        .map_or_else(|| "unknown".to_owned(), |x| x.to_string())
 }
 
 pub(super) trait CSerialize<'a> {

bindgen/ir/item.rs

@@ -786,16 +786,14 @@ impl Item {
 
         match *self.kind() {
             ItemKind::Var(ref var) => var.name().to_owned(),
-            ItemKind::Module(ref module) => {
-                module.name().map(ToOwned::to_owned).unwrap_or_else(|| {
-                    format!("_bindgen_mod_{}", self.exposed_id(ctx))
-                })
-            }
-            ItemKind::Type(ref ty) => {
-                ty.sanitized_name(ctx).map(Into::into).unwrap_or_else(|| {
-                    format!("_bindgen_ty_{}", self.exposed_id(ctx))
-                })
-            }
+            ItemKind::Module(ref module) => module.name().map_or_else(
+                || format!("_bindgen_mod_{}", self.exposed_id(ctx)),
+                ToOwned::to_owned,
+            ),
+            ItemKind::Type(ref ty) => ty.sanitized_name(ctx).map_or_else(
+                || format!("_bindgen_ty_{}", self.exposed_id(ctx)),
+                Into::into,
+            ),
             ItemKind::Function(ref fun) => {
                 let mut name = fun.name().to_owned();
 
@@ -1702,8 +1700,7 @@ impl Item {
                         ty.spelling()
                     );
                     Item::type_param(Some(id), location, ctx)
-                        .map(Ok)
-                        .unwrap_or(Err(ParseError::Recurse))
+                        .ok_or(ParseError::Recurse)
                 } else {
                     result
                 }

bindgen/options/cli.rs

@@ -703,7 +703,7 @@ where
         }
 
         fn add_derives(&self, info: &DeriveInfo<'_>) -> Vec<String> {
-            if self.kind.map(|kind| kind == info.kind).unwrap_or(true) &&
+            if self.kind.map_or(true, |kind| kind == info.kind) &&
                 self.regex_set.matches(info.name)
             {
                 return self.derives.clone();
@@ -743,7 +743,7 @@ where
         }
 
         fn add_attributes(&self, info: &AttributeInfo<'_>) -> Vec<String> {
-            if self.kind.map(|kind| kind == info.kind).unwrap_or(true) &&
+            if self.kind.map_or(true, |kind| kind == info.kind) &&
                 self.regex_set.matches(info.name)
             {
                 return self.attributes.clone();