make it more readable by faster early exitting

Author: tesuji

clippy_lints/src/no_effect.rs

@@ -258,10 +258,10 @@ fn has_no_effect(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
 
 fn check_unnecessary_operation(cx: &LateContext<'_>, stmt: &Stmt<'_>) {
     if let StmtKind::Semi(expr) = stmt.kind
+        && !in_external_macro(cx.sess(), stmt.span)
         && let ctxt = stmt.span.ctxt()
         && expr.span.ctxt() == ctxt
         && let Some(reduced) = reduce_expression(cx, expr)
-        && !in_external_macro(cx.sess(), stmt.span)
         && reduced.iter().all(|e| e.span.ctxt() == ctxt)
     {
         if let ExprKind::Index(..) = &expr.kind {