set ciphers to NULL before calling cert_cb

ssl/s3_srvr.c

diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index 6cb405d..28f3bdd 100644
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -1357,6 +1357,7 @@
 			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 			goto f_err;
 			}
+		ciphers=NULL;
 		/* Let cert callback update server certificates if required */
 		if (s->cert->cert_cb
 			&& s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
@@ -1365,7 +1366,6 @@
 			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
 			goto f_err;
 			}
-		ciphers=NULL;
 		c=ssl3_choose_cipher(s,s->session->ciphers,
 				     SSL_get_ciphers(s));