selftests: forwarding: devlink_lib: Avoid double sourcing of lib.sh

Don't source lib.sh twice and make the script work with ifnames passed
on the command line.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/mlxsw/spectrum-2/tc_flower.sh

@@ -12,6 +12,7 @@ ALL_TESTS="single_mask_test identical_filters_test two_masks_test \
 	delta_two_masks_one_key_test delta_simple_rehash_test \
 	bloom_simple_test bloom_complex_test bloom_delta_test"
 NUM_NETIFS=2
+source $lib_dir/lib.sh
 source $lib_dir/tc_common.sh
 source $lib_dir/devlink_lib.sh
 

tools/testing/selftests/drivers/net/mlxsw/spectrum/devlink_resources.sh

 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+lib_dir=$(dirname $0)/../../../../net/forwarding
+
 NUM_NETIFS=1
+source $lib_dir/lib.sh
 source devlink_lib_spectrum.sh
 
 setup_prepare()

tools/testing/selftests/drivers/net/mlxsw/spectrum/resource_scale.sh

 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+lib_dir=$(dirname $0)/../../../../net/forwarding
+
 NUM_NETIFS=6
-source ../../../../net/forwarding/tc_common.sh
+source $lib_dir/lib.sh
+source $lib_dir/tc_common.sh
 source devlink_lib_spectrum.sh
 
 current_test=""

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

 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
-##############################################################################
-# Source library
-
-relative_path="${BASH_SOURCE%/*}"
-if [[ "$relative_path" == "${BASH_SOURCE}" ]]; then
-	relative_path="."
-fi
-
-source "$relative_path/lib.sh"
-
 ##############################################################################
 # Defines