Don't free the current addrinfo list, or else a pointer to a freed

memory area would arise.  Only an addrinfo list from an earlier
call to getaddrinfo() should be freed there because it will be
substituted by the current list referenced by "res".

Reported by:	John Long <fbsd1@pruam.com>
MFC after:	5 days

libexec/ftpd/ftpd.c

@@ -785,7 +785,7 @@ inithosts(void)
 				hrp->hostname = NULL;
 				insert = 1;
 			} else {
-				if (hrp->hostinfo)
+				if (hrp->hostinfo && hrp->hostinfo != res)
 					freeaddrinfo(hrp->hostinfo);
 				insert = 0; /* host already in the chain */
 			}