[PATCH 2/4] trailer: simplify check_if_different

[Paolo Bonzini <pbonzini@redhat.com>]

The check_all argument is pointless, because the function degenerates
to !same_trailer when check_all==0 (if same_trailer fails, it always
ends up returning 1).  Remove it, switching the check_all==0 caller
to use same_trailer directly.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 trailer.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/trailer.c b/trailer.c
index 4ba28ae33..91f89db7f 100644
--- a/trailer.c
+++ b/trailer.c
@@ -194,14 +194,11 @@ static void add_arg_to_input_list(struct trailer_item *on_tok,
 
 static int check_if_different(struct trailer_item *in_tok,
 			      struct arg_item *arg_tok,
-			      int check_all,
 			      struct list_head *head)
 {
 	enum trailer_where where = arg_tok->conf.where;
 	struct list_head *next_head;
-	do {
-		if (same_trailer(in_tok, arg_tok))
-			return 0;
+	while (!same_trailer(in_tok, arg_tok)) {
 		/*
 		 * if we want to add a trailer after another one,
 		 * we have to check those before this one
@@ -209,10 +206,10 @@ static int check_if_different(struct trailer_item *in_tok,
 		next_head = after_or_end(where) ? in_tok->list.prev
 						: in_tok->list.next;
 		if (next_head == head)
-			break;
+			return 1;
 		in_tok = list_entry(next_head, struct trailer_item, list);
-	} while (check_all);
-	return 1;
+	}
+	return 0;
 }
 
 static char *apply_command(const char *command, const char *arg)
@@ -283,12 +280,12 @@ static void apply_arg_if_exists(struct trailer_item *in_tok,
 		break;
 	case EXISTS_ADD_IF_DIFFERENT:
 		apply_item_command(in_tok, arg_tok);
-		if (check_if_different(in_tok, arg_tok, 1, head))
+		if (check_if_different(in_tok, arg_tok, head))
 			add_arg_to_input_list(on_tok, arg_tok);
 		break;
 	case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
 		apply_item_command(in_tok, arg_tok);
-		if (check_if_different(on_tok, arg_tok, 0, head))
+		if (!same_trailer(on_tok, arg_tok))
 			add_arg_to_input_list(on_tok, arg_tok);
 		break;
 	default:
-- 
2.14.2