fbdev: sisfb: Clean up some inconsistent indenting

No functional modification involved.

drivers/video/fbdev/sis/sis_main.c:6165 sisfb_probe() warn: inconsistent indenting.
drivers/video/fbdev/sis/sis_main.c:4266 sisfb_post_300_rwtest() warn: inconsistent indenting.
drivers/video/fbdev/sis/sis_main.c:2388 SISDoSense() warn: inconsistent indenting.
drivers/video/fbdev/sis/sis_main.c:2531 SiS_Sense30x() warn: inconsistent indenting.
drivers/video/fbdev/sis/sis_main.c:2382 SISDoSense() warn: inconsistent indenting.
drivers/video/fbdev/sis/sis_main.c:2250 sisfb_sense_crt1() warn: inconsistent indenting.
drivers/video/fbdev/sis/sis_main.c:672 sisfb_validate_mode() warn: inconsistent indenting.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=1934
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Helge Deller <deller@gmx.de>