shm->users should not be decreased when gdev_raw_mem_share fails
shm->users should not be decreased when gdev_raw_mem_share fails

CPFL/gdev,shinpei0208/gdev,shinpei0208/gdev,CPFL/gdev,shinpei0208/gdev,shinpei0208/gdev,CPFL/gdev,CPFL/gdev