thermal: exynos: fix: Check if data->tmu_read callback is present before read
The exynos_tmu_data() function should on entrance test not only for valid data pointer, but also for data->tmu_read one. It is important, since afterwards it is dereferenced to get temperature code. Signed-off-by: NLukasz Majewski <l.majewski@samsung.com> Tested-by: NAbhilash Kesavan <a.kesavan@samsung.com> Signed-off-by: NZhang Rui <rui.zhang@intel.com>
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