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libtags: wav: do not div by zero

--- a/sys/src/cmd/audio/libtags/wav.c

+++ b/sys/src/cmd/audio/libtags/wav.c

@@ -59,6 +59,8 @@

 			csz -= 16;

 			ctx->channels = le16u(d+2);

 			ctx->samplerate = leuint(d+4);

+			if(ctx->channels < 1 || ctx->samplerate < 1)

+				return -1;

 			ctx->duration = sz*1000 / leuint(d+8);

 		}else if(memcmp(d, "LIST", 4) == 0){

 			sz = csz - 4;