perf tests test_bridge_fdb_stress.sh: Fix redirection of stderr to stdin

It's not 2&>1, the correct is 2>&1.
Signed-off-by: Patrice Duroux <patrice.duroux@gmail.com>
Cc: linux-kselftest@vger.kernel.org
Link: https://lore.kernel.org/r/20230303193058.21274-1-patrice.duroux@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/testing/selftests/drivers/net/dsa/test_bridge_fdb_stress.sh

@@ -31,7 +31,7 @@ trap 'cleanup' EXIT
 
 eth=${NETIFS[p1]}
 
-ip link del br0 2&>1 >/dev/null || :
+ip link del br0 2>&1 >/dev/null || :
 ip link add br0 type bridge && ip link set $eth master br0
 
 (while :; do