Eliminate two cases of undefined behaviour: total in _fetch_write() was

not initialized before use, and _http_growbuf() did not return a value
on success.

Reported by:	Peter Edwards <pmedwards@eircom.net>
MFC after:	2 weeks

lib/libfetch/common.c

@@ -465,6 +465,7 @@ _fetch_write(conn_t *conn, const char *buf, size_t len)
 		timeout.tv_sec += fetchTimeout;
 	}
 
+	total = 0;
 	while (len > 0) {
 		while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) {
 			FD_SET(conn->sd, &writefds);

lib/libfetch/http.c

@@ -179,6 +179,7 @@ _http_growbuf(struct httpio *io, size_t len)
 		return (-1);
 	io->buf = tmp;
 	io->bufsize = len;
+	return (0);
 }
 
 /*