fixed some smaller warnings from clippy

[robamu]

Just some easy fixes I noticed when compiling the Linux example :)
Optionally, the loop which is never reached could also be replaced by a panic! to make it clear this code is actually never reached..

[schteve]

Thanks!

FYI the unreachable code should be truly unreachable since start_scheduler() diverges - it cannot return. So that loop / print should be fine to remove.