rewrite_parents(): mark unused callback parameter

The rewrite_parents() function takes a callback, but not every callback
needs the "rev" parameter. Mark the unused one so -Wunused-parameter
will be happy.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

line-log.c

@@ -1281,7 +1281,8 @@ int line_log_process_ranges_arbitrary_commit(struct rev_info *rev, struct commit
 	return changed;
 }
 
-static enum rewrite_result line_log_rewrite_one(struct rev_info *rev, struct commit **pp)
+static enum rewrite_result line_log_rewrite_one(struct rev_info *rev UNUSED,
+						struct commit **pp)
 {
 	for (;;) {
 		struct commit *p = *pp;