fix bug in bprint.  fmtprint => fmtvprint

src/libbio/bprint.c

diff --git a/src/libbio/bprint.c b/src/libbio/bprint.c
index bfcb4a0..f15203c 100644
--- a/src/libbio/bprint.c
+++ b/src/libbio/bprint.c
@@ -11,7 +11,7 @@
 	if(Bfmtinit(&f, bp) < 0)
 		return -1;
 	va_start(args, fmt);
-	n = fmtprint(&f, fmt, args);
+	n = fmtvprint(&f, fmt, args);
 	va_end(args);
 	if(n > 0 && Bfmtflush(&f) < 0)
 		return -1;