[gdb/python] Fix python selftest with python 3.11
With python 3.11 I noticed:
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$ gdb -q -batch -ex "maint selftest python"
Running selftest python.
Self test failed: self-test failed at gdb/python/python.c:2246
Ran 1 unit tests, 1 failed
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In more detail:
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(gdb) p output
$5 = "Traceback (most recent call last):\n File \"<string>\", line 0, \
in <module>\nKeyboardInterrupt\n"
(gdb) p ref_output
$6 = "Traceback (most recent call last):\n File \"<string>\", line 1, \
in <module>\nKeyboardInterrupt\n"
...
Fix this by also allowing line number 0.
Tested on x86_64-linux.
This should hopefully fix buildbot builder gdb-rawhide-x86_64.
1 file changed
