fix: pylint false alarm on libdevice functions

[chichun-charlie-liu]

Description of the change

since ~ a week ago, pylint began to throw a "assignment-from-no-return" warning on libdevice functions in triton kernel. disable this false alarm.

Was the PR tested

• I have added >=1 unit test(s) for every new method I have added (if that coverage is difficult, please briefly explain the reason)
• I have ensured all unit tests pass

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