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	The pmic_reg_read() function can return errors.  Add a check for that.
Fixes: 4e8aa0065d4b ("button: qcom-pmic: introduce Qualcomm PMIC button driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>