Fix similar potential problems with fetchOne loops

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

apps/user_ldap/lib/Mapping/AbstractMapping.php

@@ -438,14 +438,14 @@ abstract class AbstractMapping {
 		$picker = $this->dbc->getQueryBuilder();
 		$picker->select('owncloud_name')
 			->from($this->getTableName());
-		$cursor = $picker->execute();
+		$cursor = $picker->executeQuery();
 		$result = true;
-		while ($id = $cursor->fetchOne()) {
+		while (($id = $cursor->fetchOne()) !== false) {
 			$preCallback($id);
 			if ($isUnmapped = $this->unmap($id)) {
 				$postCallback($id);
 			}
-			$result &= $isUnmapped;
+			$result = $result && $isUnmapped;
 		}
 		$cursor->closeCursor();
 		return $result;

apps/user_ldap/lib/Migration/Version1130Date20211102154716.php

@@ -259,7 +259,7 @@ class Version1130Date20211102154716 extends SimpleMigrationStep {
 
 		$result = $select->executeQuery();
 		$idList = [];
-		while ($id = $result->fetchOne()) {
+		while (($id = $result->fetchOne()) !== false) {
 			$idList[] = $id;
 		}
 		$result->closeCursor();

apps/workflowengine/lib/Manager.php

@@ -351,7 +351,7 @@ class Manager implements IManager {
 		$result = $qb->execute();
 
 		$this->operationsByScope[$scopeContext->getHash()] = [];
-		while ($opId = $result->fetchOne()) {
+		while (($opId = $result->fetchOne()) !== false) {
 			$this->operationsByScope[$scopeContext->getHash()][] = (int)$opId;
 		}
 		$result->closeCursor();

apps/workflowengine/lib/Migration/PopulateNewlyIntroducedDatabaseFields.php

@@ -57,7 +57,7 @@ class PopulateNewlyIntroducedDatabaseFields implements IRepairStep {
 		$qb = $this->dbc->getQueryBuilder();
 
 		$insertQuery = $qb->insert('flow_operations_scope');
-		while ($id = $ids->fetchOne()) {
+		while (($id = $ids->fetchOne()) !== false) {
 			$insertQuery->values(['operation_id' => $qb->createNamedParameter($id), 'type' => IManager::SCOPE_ADMIN]);
 			$insertQuery->execute();
 		}