xen/gntdev-dmabuf: Ditch dummy map functions
There's no in-kernel users for the k(un)map stuff. And the mmap one is actively harmful - return 0 and then _not_ actually mmaping can't end well. Acked-by: Sumit Semwal <sumit.semwal@linaro.org> Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Juergen Gross <jgross@suse.com> Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: xen-devel@lists.xenproject.org Link: https://patchwork.freedesktop.org/patch/msgid/20191118103536.17675-14-daniel.vetter@ffwll.ch
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