rbd: rework rbd_img_obj_exists_submit() error paths
- don't put obj_request before rbd_obj_request_get() if rbd_obj_request_create() fails - don't leak pages if rbd_obj_request_create() fails - don't leak stat_request if rbd_osd_req_create() fails Reported-by: NDavid Disseldorp <ddiss@suse.de> Signed-off-by: NIlya Dryomov <idryomov@gmail.com> Reviewed-by: NAlex Elder <elder@linaro.org> Reviewed-by: NDavid Disseldorp <ddiss@suse.de>
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