Ensure the value returned from ast_random is between 0 and RAND_MAX on 64-bit platforms.

(closes issue #11348)
Reported by: sperreault


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89637 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/utils.c

@@ -1139,8 +1139,10 @@ long int ast_random(void)
 	if (dev_urandom_fd >= 0) {
 		int read_res = read(dev_urandom_fd, &res, sizeof(res));
 		if (read_res > 0) {
+			long int rm = RAND_MAX;
 			res = res < 0 ? ~res : res;
-			return res;
+			rm++;
+			return res % rm;
 		}
 	}
 #endif