bors c0939b18b8 Auto merge of #12409 - cookie-s:fix-identityop-duplicate-errors, r=Alexendoo
[`identity_op`]: Fix duplicate diagnostics

Relates to #12379

In the `identity_op` lint, the following diagnostic was emitted two times

```
  --> tests/ui/identity_op.rs:156:5
   |
LL |     1 * 1;
   |     ^^^^^ help: consider reducing it to: `1`
   |
```

because both of the left operand and the right operand are the identity element of the multiplication.

This PR fixes the issue so that if a diagnostic is created for an operand, the check of the other operand will be skipped. It's fine because the result is always the same in the affected operators.

---

changelog: [`identity_op`]: Fix duplicate diagnostics
2024-03-04 14:43:38 +00:00
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