xtoptions: respect return value in xtables_getportbyname

If ret was negative, ntohs may make it positive, which is undesired.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/xtoptions.c b/xtoptions.c
index c3cc40e6..8478d26d 100644
--- a/xtoptions.c
+++ b/xtoptions.c
@@ -379,6 +379,8 @@ static int xtables_getportbyname(const char *name)
 		}
 	}
 	freeaddrinfo(res);
+	if (ret < 0)
+		return ret;
 	return ntohs(ret);
 }