wasmi_cli doesn't preserve WASI exit status

[yamt]

when a wasi module calls proc_exit(0), wasmi_cli says Error: failed during execution of _start: Exited with i32 exit status 0 and exit with 1.
it's common for this kind of cli wasm runner programs to relay wasi exit code to host exit(). i guess wasmi_cli should follow the convention.

[Robbepop]

@yamt Thanks a lot for reporting this wasmi_cli bug!

So this means that if a WASI program terminates with proc_exit(0) then it returns an error with exit code 0 that is acutally not an error and therefore wasmi_cli should not treat it as such?

[yamt]

@yamt Thanks a lot for reporting this wasmi_cli bug!

So this means that if a WASI program terminates with proc_exit(0) then it returns an error with exit code 0 that is acutally not an error and therefore wasmi_cli should not treat it as such?

yes.
the common convention is if a wasi command calls proc_exit(N), the runner program (in this case wasmi_cli) itself exits with exit code N.