Claude review: drm/print: describe 6th & 9th bit of drm.debug

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

Patch Review

**Correctness: Good.** The patch correctly adds the two missing bit descriptions to `MODULE_PARM_DESC`. Verified against the kernel tree:

The enum `drm_debug_category` in `include/drm/drm_print.h:98-142` defines entries in order: `DRM_UT_CORE`(0), `DRM_UT_DRIVER`(1), `DRM_UT_KMS`(2), `DRM_UT_PRIME`(3), `DRM_UT_ATOMIC`(4), `DRM_UT_VBL`(5), `DRM_UT_STATE`(6), `DRM_UT_LEASE`(7), `DRM_UT_DP`(8), `DRM_UT_DRMRES`(9). The `DECLARE_DYNDBG_CLASSMAP` at `drm_print.c:60` confirms the same order. The existing `MODULE_PARM_DESC` was indeed missing bit 6 (`STATE`) and bit 9 (`DRMRES`).

The added lines:
```
+"\t\tBit 6 (0x40)  will enable STATE messages (atomic state code)\n"
...
+"\t\tBit 9 (0x200) will enable DRMRES messages (managed resources code)");
```

These match the enum doc: `DRM_UT_STATE` is "verbose atomic state debugging" and `DRM_UT_DRMRES` is "drm managed resources code". The descriptions are consistent.

The change from `0x1ff` to `0x3ff` in `include/drm/drm_print.h:90` is also correct: with 10 categories (bits 0-9), all-bits-set is `0x3ff`, not `0x1ff` (which only covers bits 0-8). This was already wrong before `DRM_UT_DRMRES` was added — the comment was stale.

**No issues found.**

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