main: propagate error to shell

Before:

 # nft add rule ip test input ip hdrlength 3
 <cmdline>:1:1-37: Error: Could not process rule: Invalid argument
 add rule ip test input ip hdrlength 3
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 # echo $?
 0

After:

 # nft add rule ip test input ip hdrlength 3
 <cmdline>:1:1-37: Error: Could not process rule: Invalid argument
 add rule ip test input ip hdrlength 3
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 # echo $?
 1

Reported-by: Ana Rey Botello <anarey@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index bd8feee5..04a98e35 100644
--- a/src/main.c
+++ b/src/main.c
@@ -200,6 +200,8 @@ static int nft_netlink(struct parser_state *state, struct list_head *msgs)
 				netlink_io_error(&ctx, &cmd->location,
 						 "Could not process rule: %s",
 						 strerror(err->err));
+				ret = -1;
+				errno = err->err;
 				if (err->seqnum == cmd->seqnum) {
 					mnl_err_list_free(err);
 					break;