Claude review: drm/bridge: prevent encoder chain changes while iterating with list_for_each_entry_from()

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

Clean conversion of three functions to use `drm_for_each_bridge_in_chain_from()`. The parameter rename from `bridge` to `first_bridge` is appropriate.

In `drm_bridge_chain_mode_valid()`, the `return ret` inside the `drm_for_each_bridge_in_chain_from()` loop will correctly trigger the `__free` cleanup, unlocking the mutex and putting the bridge. Correct.

In `drm_bridge_chain_mode_set()` and `drm_atomic_bridge_chain_enable()`, the loop bodies don't use braces around multi-statement `if/else if` blocks — but that's consistent with the existing kernel style for these functions and technically correct since `drm_for_each_bridge_in_chain_from` expands to a `for` statement.

No issues.

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