RT3861: Mem/bio leak in req command

The "out" variable is used for both key and csr.  Close it after
writing the first one so it can be re-used when writing the other.
Signed-off-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NTim Hudson <tjh@openssl.org>

apps/req.c

@@ -612,6 +612,7 @@ int req_main(int argc, char **argv)
             }
             goto end;
         }
+        BIO_free(out);
         BIO_printf(bio_err, "-----\n");
     }