res_ari: Fix inverted test giving wrong error message.

The patch for ASTERISK_24560 inverted a test checking if the bridge name
is being updated to a different name.

* Fix the test to return "Changing bridge name is not implemented" when
someone attempts to change the bridge name.

ASTERISK-27445

Change-Id: I4b70bf08b0e02e016108b077ff75b345dec12fc9

res/ari/resource_bridges.c

@@ -968,13 +968,12 @@ void ast_ari_bridges_create_with_id(struct ast_variable *headers,
 
 	if (bridge) {
 		/* update */
-		if (!ast_strlen_zero(args->name)) {
-			if (!strcmp(args->name, bridge->name)) {
-				ast_ari_response_error(
-					response, 500, "Internal Error",
-					"Changing bridge name is not implemented");
-				return;
-			}
+		if (!ast_strlen_zero(args->name)
+			&& strcmp(args->name, bridge->name)) {
+			ast_ari_response_error(
+				response, 500, "Internal Error",
+				"Changing bridge name is not implemented");
+			return;
 		}
 		if (!ast_strlen_zero(args->type)) {
 			ast_ari_response_error(