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selftests: net: devlink_port_split: check devlink returned an element…
… before dereferencing it And thus avoid a Python stacktrace: ~/linux/tools/testing/selftests/net$ ./devlink_port_split.py Traceback (most recent call last): File "/home/linux/tools/testing/selftests/net/./devlink_port_split.py", line 277, in <module> main() File "/home/linux/tools/testing/selftests/net/./devlink_port_split.py", line 242, in main dev = list(devs.keys())[0] IndexError: list index out of range Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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