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buffer reallocation is very unlikely to be backend specific. Hence move inside the tis. Signed-off-by: Amarnath Valluri <amarnath.valluri@intel.com> Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>