When the device is started with a charger inserted, it reports 0% soc. This is because a variable "soc_at_cv" is not initialized correctly in the probe function. Fix this by initializing it appropriately to -EINVAL. Change-Id: I106f36e204c5cc4f16a8f52b9fa7a2a012282e35 Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>