Drop useless argument from breakpoint_clone
diff --git a/proc.c b/proc.c
index 4d6c0f7..c186aba 100644
--- a/proc.c
+++ b/proc.c
@@ -336,8 +336,7 @@
 
 	struct breakpoint *clone = malloc(sizeof(*clone));
 	if (clone == NULL
-	    || breakpoint_clone(clone, data->new_proc,
-				bp, data->old_proc) < 0) {
+	    || breakpoint_clone(clone, data->new_proc, bp) < 0) {
 	fail:
 		free(clone);
 		return CBS_STOP;