Fix warning in ssl2_enc

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/ssl/s2_enc.c b/ssl/s2_enc.c
index 95d6eef..329006a 100644
--- a/ssl/s2_enc.c
+++ b/ssl/s2_enc.c
@@ -137,7 +137,7 @@
 		}
 
 	/* check for NULL cipher */
-	if (ds == NULL) return;
+	if (ds == NULL) return 1;
 
 
 	bs=ds->cipher->block_size;