Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/scripts/dtc/livetree.c b/scripts/dtc/livetree.c
index c9209d5..26d0e1e 100644
--- a/scripts/dtc/livetree.c
+++ b/scripts/dtc/livetree.c
@@ -155,7 +155,7 @@
 			}
 		}
 
-		/* if no collision occured, add child to the old node. */
+		/* if no collision occurred, add child to the old node. */
 		if (new_child)
 			add_child(old_node, new_child);
 	}