fix return type from send share

Signed-off-by: Bjoern Schiessle <bjoern@schiessle.org>

lib/private/Federation/CloudFederationProviderManager.php

 			]);
 
 			if ($response->getStatusCode() === Http::STATUS_CREATED) {
-				return true;
+				$result = json_decode($response->getBody(), true);
+				return (is_array($result)) ? $result : [];
 			}
 
 		} catch (\Exception $e) {

lib/public/Federation/ICloudFederationProviderManager.php

 	 * send federated share
 	 *
 	 * @param ICloudFederationShare $share
-	 * @return bool
+	 * @return mixed
 	 *
 	 * @since 14.0.0
 	 */