Free buf when its no longer used. This helps eliminate a static analysis

warning.

PR:		ports/172566
Submitted by:	Erik Cederstrand <erik@cederstrand.dk>
Approved by:	cperciva
MFC after:	3 days

games/random/randomize_fd.c

@@ -207,6 +207,8 @@ randomize_fd(int fd, int type, int unique, double denom)
 		goto make_token;
 	}
 
+	free(buf);
+
 	for (i = numnode; i > 0; i--) {
 		selected = random() % numnode;