tests/process58: fix some shellcheck warnings
tests/process58: fix some shellcheck warnings

redhatrises/openscap,redhatrises/openscap,jan-cerny/openscap,OpenSCAP/openscap,redhatrises/openscap,redhatrises/openscap,OpenSCAP/openscap,redhatrises/openscap,ybznek/openscap,OpenSCAP/openscap,mpreisler/openscap,jan-cerny/openscap,mpreisler/openscap,mpreisler/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,mpreisler/openscap,redhatrises/openscap,mpreisler/openscap,mpreisler/openscap,Hexadorsimal/openscap,ybznek/openscap,jan-cerny/openscap,jan-cerny/openscap,Hexadorsimal/openscap,ybznek/openscap,ybznek/openscap,jan-cerny/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,ybznek/openscap,Hexadorsimal/openscap,jan-cerny/openscap,ybznek/openscap,OpenSCAP/openscap