BR 1091926: Bounds checking for command line parsing
BR 1091926: Bounds checking for command line parsing

Avoid failure if the command line has doctored arguments.

turingstudio/nasm,Distrotech/nasm,turingstudio/nasm,Distrotech/nasm,techkey/nasm,projedi/nasm,Distrotech/nasm,turingstudio/nasm,techkey/nasm,projedi/nasm,letolabs/nasm,techkey/nasm,turingstudio/nasm,techkey/nasm,projedi/nasm,Distrotech/nasm,letolabs/nasm,projedi/nasm,projedi/nasm,letolabs/nasm,techkey/nasm