Claude review: [linux-next mismerge] drm/fbdev-emulation: restore drm_fb_helper_gem_is_fb() dummy

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

Patch Review

**Correctness: Good.** The patch adds an `#else` static inline stub that returns `false` for `drm_fb_helper_gem_is_fb()`. This is the correct semantic — when fbdev emulation is disabled, there is no fbdev framebuffer, so "is this GEM object the fbdev FB?" should always return `false`.

```c
+static inline bool
+drm_fb_helper_gem_is_fb(const struct drm_fb_helper *fb_helper,
+			const struct drm_gem_object *obj)
+{
+	return false;
+}
```

The function signature matches the declaration shown in the diff context (lines 98-99):
```c
 bool drm_fb_helper_gem_is_fb(const struct drm_fb_helper *fb_helper,
 			     const struct drm_gem_object *obj);
```

**One observation:** Looking at the current drm-next tree (`drm_fb_helper.h:274`), the `#ifdef CONFIG_DRM_FBDEV_EMULATION` block currently has no `#else` at all — it just ends with `#endif`. The patch's context lines show `drm_fb_helper_gem_is_fb` declared at lines 98-99 before the `#else`, which means this patch is based on the linux-next merged state where the amdgpu tree's additions are already present. This is expected for a linux-next fixup and wouldn't apply to drm-next alone.

**Commit message: Well written.** It clearly explains the conflicting commits, includes the compiler error messages, references all three relevant Fixes: tags, and identifies precisely which stub needs restoration.

**No issues found.** The patch is a correct and minimal fix for the linux-next build breakage.

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