Fixes if chains.

Co-Authored-By: Philipp Krones <[email protected]>

Author: xiongmao86

clippy_lints/src/utils/internal_lints.rs

@@ -464,7 +464,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for CollapsibleCalls {
             if match_qpath(path, &["span_lint_and_then"]);
             if and_then_args.len() == 5;
             if let ExprKind::Closure(_, _, body_id, _, _) = &and_then_args[4].kind;
-            if let body = cx.tcx.hir().body(*body_id);
+            let body = cx.tcx.hir().body(*body_id);
             if let ExprKind::Block(block, _) = &body.value.kind;
             let stmts = &block.stmts;
             if stmts.len() == 1 && block.expr.is_none();