Use match_body directly

Author: ThibsG

clippy_lints/src/matches.rs

@@ -838,13 +838,13 @@ fn check_match_single_binding(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[A
     match match_body.kind {
         ExprKind::Block(block, _) => {
             // macro + expr_ty(body) == ()
-            if block.span.from_expansion() && cx.tables.expr_ty(&arms[0].body).is_unit() {
+            if block.span.from_expansion() && cx.tables.expr_ty(&match_body).is_unit() {
                 snippet_body.push(';');
             }
         },
         _ => {
             // expr_ty(body) == ()
-            if cx.tables.expr_ty(&arms[0].body).is_unit() {
+            if cx.tables.expr_ty(&match_body).is_unit() {
                 snippet_body.push(';');
             }
         },