[arm] fix syscall return bug, must trim_32 output!
[arm] fix syscall return bug, must trim_32 output!

futurecore/pydgin,futurecore/pydgin,cornell-brg/pydgin,cornell-brg/pydgin,futurecore/pydgin,cornell-brg/pydgin,cornell-brg/pydgin,moreati/pydgin,futurecore/pydgin,moreati/pydgin,moreati/pydgin,moreati/pydgin