Remove redundant pattern matching

Clippy emits two warnings of the form:

  warning: redundant pattern matching, consider using ...

As suggested use `is_none` and `is_ok` where appropriate.

Author: tcharding

src/miniscript/analyzable.rs

@@ -83,10 +83,7 @@ impl<Pk: MiniscriptKey, Ctx: ScriptContext> Miniscript<Pk, Ctx> {
     // It maybe possible to return a detail error type containing why the miniscript
     // failed. But doing so may require returning a collection of errors
     pub fn within_resource_limits(&self) -> bool {
-        match Ctx::check_local_validity(self) {
-            Ok(_) => true,
-            Err(_) => false,
-        }
+        Ctx::check_local_validity(self).is_ok()
     }
 
     /// Whether the miniscript contains a combination of timelocks

src/miniscript/iter.rs

@@ -258,7 +258,7 @@ impl<'a, Pk: MiniscriptKey, Ctx: ScriptContext> Iterator for Iter<'a, Pk, Ctx> {
     /// To enumerate the branches iterator uses [Miniscript::branches] function.
     fn next(&mut self) -> Option<Self::Item> {
         let mut curr = self.next;
-        if let None = curr {
+        if curr.is_none() {
             while let Some((node, child)) = self.path.pop() {
                 curr = node.get_nth_child(child);
                 if curr.is_some() {