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_mm.h b/include/drm/drm_mm.h
index b1e7809..c2f93a8 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -56,7 +56,7 @@
 };
 
 struct drm_mm {
-	/* List of all memory nodes that immediatly preceed a free hole. */
+	/* List of all memory nodes that immediately precede a free hole. */
 	struct list_head hole_stack;
 	/* head_node.node_list is the list of all memory nodes, ordered
 	 * according to the (increasing) start address of the memory node. */