Fix clippy warnings

Author: filmor

rustler/src/resource.rs

@@ -85,14 +85,8 @@ pub fn open_struct_resource_type<'a, T: ResourceTypeProvider>(
             flags,
         )
     };
-    if let Some(res) = res {
-        Some(ResourceType {
-            res,
-            struct_type: PhantomData,
-        })
-    } else {
-        None
-    }
+
+    res.map(|r| ResourceType { res: r, struct_type: PhantomData})
 }
 
 fn get_alloc_size_struct<T>() -> usize {

rustler_tests/native/rustler_test/src/test_primitives.rs

@@ -20,7 +20,7 @@ pub fn echo_u8<'a>(env: Env<'a>, args: &[Term<'a>]) -> NifResult<Term<'a>> {
 
 pub fn option_inc<'a>(env: Env<'a>, args: &[Term<'a>]) -> NifResult<Term<'a>> {
     let opt: Option<f64> = args[0].decode()?;
-    let incremented = opt.and_then(|num| Some(num + 1.0));
+    let incremented = opt.map(|num| num + 1.0);
     Ok(incremented.encode(env))
 }