clk: Correct handling of NULL clk in __clk_{get, put}
Ensure clk->kref is dereferenced only when clk is not NULL. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Tested-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
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