Fix a build error due to missing virt_to_phys()
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: f0a1bf29 ("vmw_balloon: fix inflation with batching")
Cc: stable@vger.kernel.org
Cc: Xavier Deguillard <xdeguillard@vmware.com>
Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>