mips: Fix spacing issue

Fix some indentation issues and remove the following checkpatch issue:
- ERROR: need consistent spacing around '-' (ctx:WxV)

Co-Developed-by: Ladislav Michl <oss-lists@triops.cz>
Signed-off-by: Franziska Naepelt <franziska.naepelt@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>