drm/nouveau/clk: fix gcc-7 -Wint-in-bool-context warning

Submitted by Arnd Bergmann on Sept. 6, 2017, 1:56 p.m.

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Reviewer None
Submitted Sept. 6, 2017, 1:56 p.m.
Last Updated Jan. 16, 2018, 1:50 p.m.
Revision 3

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