Fix psalm errors related to filesizes

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

lib/private/Files/Storage/Common.php

@@ -695,9 +695,9 @@ abstract class Common implements Storage, ILockingStorage, IWriteStreamStorage {
 		$result = $this->copyFromStorage($sourceStorage, $sourceInternalPath, $targetInternalPath, true);
 		if ($result) {
 			if ($sourceStorage->is_dir($sourceInternalPath)) {
-				$result = $result && $sourceStorage->rmdir($sourceInternalPath);
+				$result = $sourceStorage->rmdir($sourceInternalPath);
 			} else {
-				$result = $result && $sourceStorage->unlink($sourceInternalPath);
+				$result = $sourceStorage->unlink($sourceInternalPath);
 			}
 		}
 		return $result;

lib/private/Files/Storage/Wrapper/Availability.php

@@ -451,6 +451,9 @@ class Availability extends Wrapper {
 	}
 
 	/**
+	 * @template T of StorageNotAvailableException|null
+	 * @param T $e
+	 * @psalm-return (T is null ? void : never)
 	 * @throws StorageNotAvailableException
 	 */
 	protected function setUnavailable(?StorageNotAvailableException $e): void {

lib/private/Files/Storage/Wrapper/Encryption.php

@@ -134,7 +134,7 @@ class Encryption extends Wrapper {
 	 * see https://www.php.net/manual/en/function.filesize.php
 	 * The result for filesize when called on a folder is required to be 0
 	 */
-	public function filesize(string $path): int|float {
+	public function filesize(string $path): false|int|float {
 		$fullPath = $this->getFullPath($path);
 
 		/** @var CacheEntry $info */

lib/private/Files/Stream/Encryption.php

@@ -143,8 +143,8 @@ class Encryption extends Wrapper {
 	 * @param \OC\Encryption\Util $util
 	 * @param \OC\Encryption\File $file
 	 * @param string $mode
-	 * @param int $size
-	 * @param int $unencryptedSize
+	 * @param int|float $size
+	 * @param int|float $unencryptedSize
 	 * @param int $headerSize
 	 * @param bool $signed
 	 * @param string $wrapper stream wrapper class

lib/private/LargeFileHelper.php

@@ -184,13 +184,10 @@ class LargeFileHelper {
 
 	/**
 	 * Returns the current mtime for $fullPath
-	 *
-	 * @param string $fullPath
-	 * @return int
 	 */
 	public function getFileMtime(string $fullPath): int {
 		try {
-			$result = filemtime($fullPath);
+			$result = filemtime($fullPath) ?: -1;
 		} catch (\Exception $e) {
 			$result = - 1;
 		}
@@ -198,7 +195,7 @@ class LargeFileHelper {
 			if (\OCP\Util::isFunctionEnabled('exec')) {
 				$os = strtolower(php_uname('s'));
 				if (strpos($os, 'linux') !== false) {
-					return $this->exec('stat -c %Y ' . escapeshellarg($fullPath));
+					return (int)($this->exec('stat -c %Y ' . escapeshellarg($fullPath)) ?? -1);
 				}
 			}
 		}