Set reference count earlier

Backport of 0e04674e96

Reviewed-by: Steve Henson <steve@openssl.org>

RT #4047, #4110, MR #1356

ssl/ssl_cert.c

@@ -227,6 +227,7 @@ CERT *ssl_cert_dup(CERT *cert)
 
     memset(ret, 0, sizeof(CERT));
 
+    ret->references = 1;
     ret->key = &ret->pkeys[cert->key - &cert->pkeys[0]];
     /*
      * or ret->key = ret->pkeys + (cert->key - cert->pkeys), if you find that
@@ -325,7 +326,6 @@ CERT *ssl_cert_dup(CERT *cert)
 #endif
     }
 
-    ret->references = 1;
     /*
      * Set digests to defaults. NB: we don't copy existing values as they
      * will be set during handshake.