Workaround rustc bug

Author: Jarcho

clippy_utils/src/macros.rs

@@ -859,15 +859,16 @@ impl<'tcx> FormatArgsExpn<'tcx> {
     pub fn find_nested(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, expn_id: ExpnId) -> Option<Self> {
         for_each_expr(expr, |e| {
             let e_ctxt = e.span.ctxt();
-            if e_ctxt == expr.span.ctxt() {
+            let res = if e_ctxt == expr.span.ctxt() {
                 ControlFlow::Continue(Descend::Yes)
             } else if e_ctxt.outer_expn().is_descendant_of(expn_id)
                 && let Some(args) = FormatArgsExpn::parse(cx, e)
             {
                 ControlFlow::Break(args)
             } else {
                 ControlFlow::Continue(Descend::No)
-            }
+            };
+            res
         })
     }