When an error was detected when checking the marks, a message was
correctly printed mentioning the error but followed by another one
saying everything was OK and the selftest was not marked as failed as
expected.

Now the 'ret' variable is directly set to 1 in order to make sure the
exit is done with an error, similar to what is done in other functions.
While at it, the error is correctly propagated to the caller.

Link: https://github.com/multipath-tcp/mptcp_net-next/issues/368
Fixes: dc65fe82fb07 ("selftests: mptcp: add packet mark test case")
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
---
 tools/testing/selftests/net/mptcp/mptcp_sockopt.sh | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
index c21bfd7f0c01..dc8d473fc82c 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
@@ -128,6 +128,7 @@ check_mark()
 	for v in $values; do
 		if [ $v -ne 0 ]; then
 			echo "FAIL: got $tables $values in ns $ns , not 0 - not all expected packets marked" 1>&2
+			ret=1
 			return 1
 		fi
 	done
@@ -227,11 +228,11 @@ do_transfer()
 	fi
 
 	if [ $local_addr = "::" ];then
-		check_mark $listener_ns 6
-		check_mark $connector_ns 6
+		check_mark $listener_ns 6 || retc=1
+		check_mark $connector_ns 6 || retc=1
 	else
-		check_mark $listener_ns 4
-		check_mark $connector_ns 4
+		check_mark $listener_ns 4 || retc=1
+		check_mark $connector_ns 4 || retc=1
 	fi
 
 	check_transfer $cin $sout "file received by server"

-- 
2.40.1