Claude review: drm/client: log: Look up glyph shape with font helper

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

Patch Review

Converts `drm_log_draw_line()` in `drm_log.c`:

```c
-		src = drm_draw_get_char_bitmap(font, s[i], font_pitch);
-		drm_log_blit(&map, fb->pitches[0], src, font_pitch,
-			     scanout->scaled_font_h, scanout->scaled_font_w,
-			     px_width, color);
+		src = font_data_glyph_buf(font->data, font->width, font->height,
+					  (unsigned char)s[i]);
+		if (src)
+			drm_log_blit(&map, fb->pitches[0], src, font_pitch,
+				     scanout->scaled_font_h, scanout->scaled_font_w,
+				     px_width, color);
 		iosys_map_incr(&map, scanout->scaled_font_w * px_width);
```

The `(unsigned char)` cast on `s[i]` is correct — `s` is `const char *`, and casting to `unsigned char` converts the range from [-128, 127] to [0, 255] before widening to `unsigned int`.

The `iosys_map_incr()` call remains outside the `if (src)` block, which is correct — it advances the cursor position unconditionally, so a missing glyph leaves a blank space rather than causing subsequent characters to shift left.

**No bugs. Looks good.**

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Generated by Claude Code Patch Reviewer