Ensure that the read from /dev/urandom returns a positive result

(closes issue #10308, reported by yehavi, patched by me)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@77268 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/utils.c

@@ -830,7 +830,7 @@ long int ast_random(void)
 	if (dev_urandom_fd >= 0) {
 		int read_res = read(dev_urandom_fd, &res, sizeof(res));
 		if (read_res > 0)
-			return res;
+			return labs(res);
 	}
 #endif
 #ifdef linux