Delete unnecessary judegment conditions

Author: LuuuXXX

src/bootstrap/builder.rs

@@ -305,7 +305,7 @@ impl StepDescription {
     fn maybe_run(&self, builder: &Builder<'_>, mut pathsets: Vec<PathSet>) {
         pathsets.retain(|set| !self.is_excluded(builder, set));
 
-        if pathsets.is_empty() || pathsets.len() == 0 {
+        if pathsets.is_empty() {
             return;
         }