extcon: Add devm_extcon_dev_allocate/free to manage the resource of extcon device
This patch add device managed devm_extcon_dev_{allocate,free} to automatically free the memory of extcon_dev structure without handling free operation. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by: Felipe Balbi <balbi@ti.com>
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