staging: unisys: visorhba: use tab to indent instead of whitespace

changed the whitespace to tab to comply with kernel coding style.

Signed-off-by: Liu Junqi <liujunqi@pku.edu.cn>
Link: https://lore.kernel.org/r/20211118033737.576775-1-liujunqi@pku.edu.cn


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>