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1. rpmsgdev ioctl: should assgin back the client return value to cookie->result, then this return value can be returned to the application; 2. rpmsgdev seek: the type "off_t" may be 64bit, so modify the offset in "struct rpmsgdev_lseek" to int64_t too; 3. rpmsgdev_seek: the rpmsgdev_seek in client should update the filep->f_pos after the seek operation; Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>