Fix a broken link in a comment.

Bug: https://code.google.com/p/android/issues/detail?id=197784
Change-Id: I2f9e5bc2dd2b8a6992c7c55bc856e4a323c7c8a8
diff --git a/libc/bionic/libc_init_common.cpp b/libc/bionic/libc_init_common.cpp
index b0c62d6..d16b452 100644
--- a/libc/bionic/libc_init_common.cpp
+++ b/libc/bionic/libc_init_common.cpp
@@ -336,7 +336,7 @@
 
   if (getauxval(AT_SECURE)) {
     // If this is a setuid/setgid program, close the security hole described in
-    // ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc
+    // https://www.freebsd.org/security/advisories/FreeBSD-SA-02:23.stdio.asc
     __nullify_closed_stdio();
 
     __sanitize_environment_variables(args.envp);