Make Clippy happy

Author: adamreichold

src/array.rs

@@ -449,7 +449,7 @@ impl<T: Element, D: Dimension> PyArray<T, D> {
     {
         let dims = dims.into_dimension();
         let container = SliceBox::new(boxed_slice);
-        let data_ptr = data_ptr.unwrap_or_else(|| container.data.as_ptr());
+        let data_ptr = data_ptr.unwrap_or(container.data.as_ptr());
         let cell = pyo3::PyClassInitializer::from(container)
             .create_cell(py)
             .expect("Object creation failed.");

src/npyiter.rs

@@ -186,6 +186,7 @@ impl<'py, T: Element> NpySingleIterBuilder<'py, T, ReadWrite> {
 
 impl<'py, T: Element, I: IterMode> NpySingleIterBuilder<'py, T, I> {
     /// Sets a flag to this builder, returning `self`.
+    #[must_use]
     pub fn set(mut self, flag: NpyIterFlag) -> Self {
         self.flags |= flag.to_c_enum();
         self
@@ -388,6 +389,7 @@ impl<'py, T: Element> NpyMultiIterBuilder<'py, T, ()> {
     }
 
     /// Set a flag to this builder, returning `self`.
+    #[must_use]
     pub fn set(mut self, flag: NpyIterFlag) -> Self {
         self.flags |= flag.to_c_enum();
         self