Fix erroneous goto lable

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2116)
diff --git a/ssl/statem/statem_clnt.c b/ssl/statem/statem_clnt.c
index 9b9d6cd..a80d670 100644
--- a/ssl/statem/statem_clnt.c
+++ b/ssl/statem/statem_clnt.c
@@ -1331,7 +1331,7 @@
                                        sizeof(sctpauthkey),
                                        labelbuffer,
                                        sizeof(labelbuffer), NULL, 0, 0) <= 0)
-            goto err;
+            goto f_err;
 
         BIO_ctrl(SSL_get_wbio(s),
                  BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,