[PATCH] selftests:mptcp: fix empty optstring

[Li Zhijian <zhijianx.li@xxxxxxxxx>]

From: Li Zhijian <lizhijian@xxxxxxxxxxxxxx>

Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxxxxx>
---
 tools/testing/selftests/net/mptcp/pm_netlink.sh | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/pm_netlink.sh b/tools/testing/selftests/net/mptcp/pm_netlink.sh
index 9172746b6cf0..8c7998c64d9e 100755
--- a/tools/testing/selftests/net/mptcp/pm_netlink.sh
+++ b/tools/testing/selftests/net/mptcp/pm_netlink.sh
@@ -8,8 +8,7 @@ usage() {
 	echo "Usage: $0 [ -h ]"
 }
 
-
-while getopts "$optstring" option;do
+while getopts "h" option;do
 	case "$option" in
 	"h")
 		usage $0
-- 
2.17.1