Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/drm/drm_mode.h b/include/drm/drm_mode.h
index ae6b7a3..c4961ea 100644
--- a/include/drm/drm_mode.h
+++ b/include/drm/drm_mode.h
@@ -277,7 +277,7 @@
 #define DRM_MODE_CURSOR_MOVE	(1<<1)
 
 /*
- * depending on the value in flags diffrent members are used.
+ * depending on the value in flags different members are used.
  *
  * CURSOR_BO uses
  *    crtc