efi_variable_import(): make sure var.data_size is set.
efi_variable_import(): make sure var.data_size is set.

Covscan noticed that var.data_size isn't set when we memcpy the
structure.  It should be set.

Signed-off-by: Peter Jones <2e0a021e603479ff81838c00c3b770daca4e0214@redhat.com>

rhinstaller/efivar,rhinstaller/efivar,rhboot/efivar,rhboot/efivar,vathpela/efivar-devel