greybus: gb_operation: drop operation refcount on cancel
An extra reference is taken out on an operation in gb_operation_request_send(). If the response never arrives, we need to put back the reference. Signed-off-by: NPerry Hung <perry@leaflabs.com> Tested-by: NMitchell Tasman <tasman@leaflabs.com> Reviewed-by: NAlex Elder <elder@linaro.org> Signed-off-by: NGreg Kroah-Hartman <greg@kroah.com>
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