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flac: fix possible mime buffer overflow (used wrong offset)

--- a/flac.c

+++ b/flac.c

@@ -45,7 +45,7 @@

 			sz -= 8;

 			n = beuint(&d[4]);

 			mime = ctx->buf+20;

-			if(n >= sz || n >= ctx->bufsz-1 || ctx->read(ctx, mime, n) != n)

+			if(n >= sz || n >= ctx->bufsz-20 || ctx->read(ctx, mime, n) != n)

 				return -1;

 			sz -= n;

 			mime[n] = 0;