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[`manual_retain`]: Fix duplicate diagnostics Relates to: #12379 The first lint guard executed in `LateLintPass::check_expr` was testing if the parent was of type `ExprKind::Assign`. This meant the lint emitted on both sides of the assignment operator when `check_expr` is called on either `Expr`. The guard in the fix only lints once when the `Expr` is of kind `Assign`. changelog: Fix duplicate lint diagnostic emission from [`manual_retain`]