ocsp.c doesn't free the whole output chain, maybe causing a memory leak

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5224)

apps/ocsp.c

diff --git a/apps/ocsp.c b/apps/ocsp.c
index 122aee6..bd16a5b 100644
--- a/apps/ocsp.c
+++ b/apps/ocsp.c
@@ -730,7 +730,7 @@
     free_index(rdb);
     BIO_free_all(cbio);
     BIO_free_all(acbio);
-    BIO_free(out);
+    BIO_free_all(out);
     OCSP_REQUEST_free(req);
     OCSP_RESPONSE_free(resp);
     OCSP_BASICRESP_free(bs);