The variable 'ret' has been defined in every script. This patch moves it
into mptcp_lib.sh as a public variable.

Signed-off-by: Geliang Tang <geliang.tang@linux.dev>
---
 tools/testing/selftests/net/mptcp/diag.sh          | 1 -
 tools/testing/selftests/net/mptcp/mptcp_connect.sh | 1 -
 tools/testing/selftests/net/mptcp/mptcp_join.sh    | 1 -
 tools/testing/selftests/net/mptcp/mptcp_lib.sh     | 2 ++
 tools/testing/selftests/net/mptcp/mptcp_sockopt.sh | 1 -
 tools/testing/selftests/net/mptcp/pm_netlink.sh    | 1 -
 tools/testing/selftests/net/mptcp/simult_flows.sh  | 1 -
 tools/testing/selftests/net/mptcp/userspace_pm.sh  | 1 -
 8 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/diag.sh b/tools/testing/selftests/net/mptcp/diag.sh
index efef4692a4c9..7c71d589c2f8 100755
--- a/tools/testing/selftests/net/mptcp/diag.sh
+++ b/tools/testing/selftests/net/mptcp/diag.sh
@@ -10,7 +10,6 @@ ksft_skip=4
 test_cnt=1
 timeout_poll=100
 timeout_test=$((timeout_poll * 2 + 1))
-ret=0
 
 flush_pids()
 {
diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index 7898d62fce0b..e3f1afa8011b 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -6,7 +6,6 @@
 time_start=$(date +%s)
 
 optstring="S:R:d:e:l:r:h4cm:f:tC"
-ret=0
 final_ret=0
 sin=""
 sout=""
diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 0e05024f6dd8..fd217d4bad5b 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -12,7 +12,6 @@
 
 . "$(dirname "${0}")/mptcp_lib.sh"
 
-ret=0
 sin=""
 sinfail=""
 sout=""
diff --git a/tools/testing/selftests/net/mptcp/mptcp_lib.sh b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
index 927fb0c18142..94eed09ceedd 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_lib.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
@@ -8,6 +8,8 @@ readonly KSFT_SKIP=4
 # shellcheck disable=SC2155 # declare and assign separately
 readonly KSFT_TEST=$(basename "${0}" | sed 's/\.sh$//g')
 
+ret=0
+
 MPTCP_LIB_SUBTESTS=()
 
 # only if supported (or forced) and not disabled, see no-color.org
diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
index c643872ddf47..6d2f4af087d7 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
@@ -3,7 +3,6 @@
 
 . "$(dirname "${0}")/mptcp_lib.sh"
 
-ret=0
 sin=""
 sout=""
 cin=""
diff --git a/tools/testing/selftests/net/mptcp/pm_netlink.sh b/tools/testing/selftests/net/mptcp/pm_netlink.sh
index ed1e8380838a..b2e3ecbc376c 100755
--- a/tools/testing/selftests/net/mptcp/pm_netlink.sh
+++ b/tools/testing/selftests/net/mptcp/pm_netlink.sh
@@ -4,7 +4,6 @@
 . "$(dirname "${0}")/mptcp_lib.sh"
 
 ksft_skip=4
-ret=0
 
 usage() {
 	echo "Usage: $0 [ -h ]"
diff --git a/tools/testing/selftests/net/mptcp/simult_flows.sh b/tools/testing/selftests/net/mptcp/simult_flows.sh
index d54ee402ac06..f18dfafb5710 100755
--- a/tools/testing/selftests/net/mptcp/simult_flows.sh
+++ b/tools/testing/selftests/net/mptcp/simult_flows.sh
@@ -13,7 +13,6 @@ ksft_skip=4
 timeout_poll=30
 timeout_test=$((timeout_poll * 2 + 1))
 test_cnt=1
-ret=0
 bail=0
 slack=50
 
diff --git a/tools/testing/selftests/net/mptcp/userspace_pm.sh b/tools/testing/selftests/net/mptcp/userspace_pm.sh
index d248ff3eff98..845400741cf2 100755
--- a/tools/testing/selftests/net/mptcp/userspace_pm.sh
+++ b/tools/testing/selftests/net/mptcp/userspace_pm.sh
@@ -54,7 +54,6 @@ sec=$(date +%s)
 rndh=$(printf %x "$sec")-$(mktemp -u XXXXXX)
 ns1="ns1-$rndh"
 ns2="ns2-$rndh"
-ret=0
 TEST_NAME=""
 
 _printf() {
-- 
2.35.3