selftests: mptcp: sockopt: fix shellcheck warnings

shellcheck recently helped to prevent issues. It is then good to fix the
other harmless issues in order to spot "real" ones later.

Here, two categories of warnings are now ignored:

- SC2317: Command appears to be unreachable. The cleanup() function is
  invoked indirectly via the EXIT trap.

- SC2086: Double quote to prevent globbing and word splitting. This is
  recommended, but the current usage is correct and there is no need to
  do all these modifications to be compliant with this rule.

For the modifications:

  - SC2034: ksft_skip appears unused.
  - SC2006: Use $(...) notation instead of legacy backticks `...`.
  - SC2145: Argument mixes string and array. Use * or separate argument.

Now this script is shellcheck (0.9.0) compliant. We can easily spot new
issues.
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240306-upstream-net-next-20240304-selftests-mptcp-shared-code-shellcheck-v2-9-bc79e6e5e6a0@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/mptcp/mptcp_sockopt.sh

 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+# Double quotes to prevent globbing and word splitting is recommended in new
+# code but we accept it, especially because there were too many before having
+# address all other issues detected by shellcheck.
+#shellcheck disable=SC2086
+
 . "$(dirname "${0}")/mptcp_lib.sh"
 
 ret=0
@@ -8,7 +13,6 @@ sin=""
 sout=""
 cin=""
 cout=""
-ksft_skip=4
 timeout_poll=30
 timeout_test=$((timeout_poll * 2 + 1))
 iptables="iptables"
@@ -41,7 +45,7 @@ init()
 	mptcp_lib_ns_init ns1 ns2 ns_sbox
 
 	local i
-	for i in `seq 1 4`; do
+	for i in $(seq 1 4); do
 		ip link add ns1eth$i netns "$ns1" type veth peer name ns2eth$i netns "$ns2"
 		ip -net "$ns1" addr add 10.0.$i.1/24 dev ns1eth$i
 		ip -net "$ns1" addr add dead:beef:$i::1/64 dev ns1eth$i nodad
@@ -68,6 +72,8 @@ init()
 	add_mark_rules $ns2 2
 }
 
+# This function is used in the cleanup trap
+#shellcheck disable=SC2317
 cleanup()
 {
 	mptcp_lib_ns_exit "${ns1}" "${ns2}" "${ns_sbox}"
@@ -257,12 +263,12 @@ do_tcpinq_test()
 	local lret=$?
 	if [ $lret -ne 0 ];then
 		ret=$lret
-		echo "FAIL: mptcp_inq $@" 1>&2
+		echo "FAIL: mptcp_inq $*" 1>&2
 		mptcp_lib_result_fail "TCP_INQ: $*"
 		return $lret
 	fi
 
-	echo "PASS: TCP_INQ cmsg/ioctl $@"
+	echo "PASS: TCP_INQ cmsg/ioctl $*"
 	mptcp_lib_result_pass "TCP_INQ: $*"
 	return $lret
 }