fix: Handle null checks with the ?? operator

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

apps/files_sharing/lib/External/Manager.php

@@ -119,7 +119,7 @@ class Manager {
 	 * @throws \Doctrine\DBAL\Exception
 	 */
 	public function addShare($remote, $token, $password, $name, $owner, $shareType, $accepted = false, $user = null, $remoteId = '', $parent = -1) {
-		$user = $user ?: $this->uid;
+		$user = $user ?? $this->uid;
 		$accepted = $accepted ? IShare::STATUS_ACCEPTED : IShare::STATUS_PENDING;
 		$name = Filesystem::normalizePath('/' . $name);
 

lib/private/Log/LogDetails.php

@@ -37,7 +37,7 @@ abstract class LogDetails {
 		$url = ($request->getRequestUri() !== '') ? $request->getRequestUri() : '--';
 		$method = is_string($request->getMethod()) ? $request->getMethod() : '--';
 		if ($this->config->getValue('installed', false)) {
-			$user = \OC_User::getUser() ?: '--';
+			$user = \OC_User::getUser() ?? '--';
 		} else {
 			$user = '--';
 		}

lib/private/User/Database.php

@@ -64,7 +64,7 @@ class Database extends ABackend implements
 	public function __construct($eventDispatcher = null, $table = 'users') {
 		$this->cache = new CappedMemoryCache();
 		$this->table = $table;
-		$this->eventDispatcher = $eventDispatcher ?: \OCP\Server::get(IEventDispatcher::class);
+		$this->eventDispatcher = $eventDispatcher ?? \OCP\Server::get(IEventDispatcher::class);
 	}
 
 	/**