[hotfix] Remove redundant backslash in the log of GPUDriver

[KarmaGYZ]

What is the purpose of the change

Remove redundant backslash in the log of GPUDriver

Brief change log

Remove redundant backslash in the log of GPUDriver

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

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Last check on commit 0704f53 (Thu Jun 04 09:19:35 UTC 2020)

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• ❓ 1. The [description] looks good.
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• ❓ 5. Overall code [quality] is good.

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CI report:

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[xintongsong]

Thanks @KarmaGYZ. LGTM.
Merging this now.

[xintongsong]

master: ad828cb
1.11.0: 3f43fc6