thermal: samsung: Fix incorrect check after code merge

Merge commit 19785cf9 ("Merge branch 'linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal"

)
broke the code introduced by commit ffe6e16f ("thermal: exynos: Reduce
severity of too early temperature read"). Restore the original code from
the mentioned commit to finally fix the warning message during boot:

thermal thermal_zone0: failed to read out thermal zone (-22)

Reported-by: Marian Mihailescu <mihailescu2m@gmail.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Fixes: 19785cf9 ("Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal"

)
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>