Fix lock-up when a special-file option is given with another option in the same argv string (e.g. sox -np synth ...).
Fix lock-up when a special-file option is given with another option in
the same argv string (e.g. sox -np synth ...).

mhartzel/sox_personal_fork,pcqpcq/sox,Distrotech/sox,MageSlayer/sox,MageSlayer/sox,Motiejus/sox,cbagwell/sox,davel/sox,Motiejus/sox,davel/sox,pcqpcq/sox,cbagwell/sox,uklauer/sox,Distrotech/sox,mhartzel/sox_personal_fork,Distrotech/sox,uklauer/sox,cbagwell/sox,mhartzel/sox_personal_fork,jacksonh/sox,MageSlayer/sox,Motiejus/sox,CaptainHayashi/sox,uklauer/sox,MageSlayer/sox,pcqpcq/sox,pcqpcq/sox,davel/sox,davel/sox,Motiejus/sox,cbagwell/sox,CaptainHayashi/sox,jacksonh/sox,CaptainHayashi/sox,mhartzel/sox_personal_fork,jacksonh/sox,MageSlayer/sox,uklauer/sox,jacksonh/sox,CaptainHayashi/sox,Distrotech/sox