fix SPI transport attributes not showing up in sysfs

There was a typo in the host patch that
wrongly added a null into the target attributes.

drivers/scsi/scsi_transport_spi.c

@@ -814,7 +814,7 @@ spi_attach_transport(struct spi_function_template *ft)
 
 	BUG_ON(count > SPI_HOST_ATTRS);
 
-	i->attrs[count] = NULL;
+	i->host_attrs[count] = NULL;
 
 	return &i->t;
 }