devres: Initialize an uninitialized struct member

Initialize an uninitialized struct member for driver API
devres_open_group().

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/1719931914-19035-4-git-send-email-quic_zijuhu@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>