This fix solves this error, when calling kselftest with targets
"drivers/net":

File "tools/testing/selftests/net/lib/py/nsim.py", line 64, in __init__
  if e.errno == errno.ENOSPC:
NameError: name 'errno' is not defined

The error was found by running tests manually with the command:
make kselftest TARGETS="drivers/net"

The module errno makes available standard error system symbols.

Reviewed-by: Petr Machata <pe...@nvidia.com>
Signed-off-by: Alessandro Zanni <alessandro.zann...@gmail.com>
---

Notes:
    v2: added how to run the test

 tools/testing/selftests/net/lib/py/nsim.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/net/lib/py/nsim.py 
b/tools/testing/selftests/net/lib/py/nsim.py
index f571a8b3139b..1a8cbe9acc48 100644
--- a/tools/testing/selftests/net/lib/py/nsim.py
+++ b/tools/testing/selftests/net/lib/py/nsim.py
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
+import errno
 import json
 import os
 import random
-- 
2.43.0


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