selftests: forwarding: tc_actions: cleanup temporary files when test is aborted

remove temporary files created by 'mirred_egress_to_ingress_tcp' test
in the cleanup() handler. Also, change variable names to avoid clashing
with globals from lib.sh.
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Link: https://lore.kernel.org/r/091649045a017fc00095ecbb75884e5681f7025f.1676368027.git.dcaratti@redhat.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/forwarding/tc_actions.sh

@@ -201,10 +201,10 @@ mirred_egress_to_ingress_test()
 
 mirred_egress_to_ingress_tcp_test()
 {
-	local tmpfile=$(mktemp) tmpfile1=$(mktemp)
+	mirred_e2i_tf1=$(mktemp) mirred_e2i_tf2=$(mktemp)
 
 	RET=0
-	dd conv=sparse status=none if=/dev/zero bs=1M count=2 of=$tmpfile
+	dd conv=sparse status=none if=/dev/zero bs=1M count=2 of=$mirred_e2i_tf1
 	tc filter add dev $h1 protocol ip pref 100 handle 100 egress flower \
 		$tcflags ip_proto tcp src_ip 192.0.2.1 dst_ip 192.0.2.2 \
 			action ct commit nat src addr 192.0.2.2 pipe \
@@ -220,11 +220,11 @@ mirred_egress_to_ingress_tcp_test()
 		ip_proto icmp \
 			action drop
 
-	ip vrf exec v$h1 nc --recv-only -w10 -l -p 12345 -o $tmpfile1  &
+	ip vrf exec v$h1 nc --recv-only -w10 -l -p 12345 -o $mirred_e2i_tf2  &
 	local rpid=$!
-	ip vrf exec v$h1 nc -w1 --send-only 192.0.2.2 12345 <$tmpfile
+	ip vrf exec v$h1 nc -w1 --send-only 192.0.2.2 12345 <$mirred_e2i_tf1
 	wait -n $rpid
-	cmp -s $tmpfile $tmpfile1
+	cmp -s $mirred_e2i_tf1 $mirred_e2i_tf2
 	check_err $? "server output check failed"
 
 	$MZ $h1 -c 10 -p 64 -a $h1mac -b $h1mac -A 192.0.2.1 -B 192.0.2.1 \
@@ -241,7 +241,7 @@ mirred_egress_to_ingress_tcp_test()
 	tc filter del dev $h1 egress protocol ip pref 101 handle 101 flower
 	tc filter del dev $h1 ingress protocol ip pref 102 handle 102 flower
 
-	rm -f $tmpfile $tmpfile1
+	rm -f $mirred_e2i_tf1 $mirred_e2i_tf2
 	log_test "mirred_egress_to_ingress_tcp ($tcflags)"
 }
 
@@ -270,6 +270,8 @@ setup_prepare()
 
 cleanup()
 {
+	local tf
+
 	pre_cleanup
 
 	switch_destroy
@@ -280,6 +282,8 @@ cleanup()
 
 	ip link set $swp2 address $swp2origmac
 	ip link set $swp1 address $swp1origmac
+
+	for tf in $mirred_e2i_tf1 $mirred_e2i_tf2; do rm -f $tf; done
 }
 
 mirred_egress_redirect_test()