Look for more than 1 buffer and warn user.  Attempt to fix segfault occuring on some peoples boxes during playback.
Look for more than 1 buffer and warn user.  Attempt to fix
segfault occuring on some peoples boxes during playback.

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