BUG/MINOR: ssl: ssl_sock_prepare_ssl_ctx does not return an error code

The return value check was wrongly based on error codes when the
function actually returns an error number.
This bug was introduced by f3eedfe
which is a feature not present before branch 2.4.

It does not need to be backported.

Author: rlebreton

src/ssl_ckch.c

@@ -1259,6 +1259,7 @@ static int cli_io_handler_commit_cert(struct appctx *appctx)
 	int y = 0;
 	char *err = NULL;
 	int errcode = 0;
+	int retval = 0;
 	struct ckch_store *old_ckchs, *new_ckchs = NULL;
 	struct ckch_inst *ckchi, *ckchis;
 	struct buffer *trash = alloc_trash_chunk();
@@ -1337,8 +1338,8 @@ static int cli_io_handler_commit_cert(struct appctx *appctx)
 					new_inst->server = ckchi->server;
 					/* Create a new SSL_CTX and link it to the new instance. */
 					if (new_inst->is_server_instance) {
-						errcode |= ssl_sock_prepare_srv_ssl_ctx(ckchi->server, new_inst->ctx);
-						if (errcode & ERR_CODE)
+						retval = ssl_sock_prepare_srv_ssl_ctx(ckchi->server, new_inst->ctx);
+						if (retval)
 							goto error;
 					}