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libpcm: fix pcmratio - forgot to adjust for output frame size

--- a/sys/src/libpcm/conv.c

+++ b/sys/src/libpcm/conv.c

@@ -715,13 +715,14 @@

 int

 pcmratio(Pcmconv *c, int insz)

 {

-	int outsz;

+	int outsz, fsz;

-	if(insz < c->idesc.framesz)

+	fsz = c->idesc.framesz;

+	if(insz < fsz)

 		goto Bad;

-	insz /= c->idesc.framesz;

-	outsz = ((uvlong)insz * ((uvlong)c->odesc.rate<<Np)/c->idesc.rate) >> Np;

-	if(outsz > 1)

+	insz = (insz + fsz)/fsz;

+	outsz = ((uvlong)insz * c->odesc.framesz * ((uvlong)c->odesc.rate<<Np)/c->idesc.rate) >> Np;

+	if(outsz >= c->odesc.framesz)

 		return outsz;

 Bad:

 	werrstr("invalid buffer size: %d", insz);