fixes #5367 An error occurred

lib/private/connector/sabre/file.php

@@ -215,7 +215,7 @@ class OC_Connector_Sabre_File extends OC_Connector_Sabre_Node implements Sabre_D
 			if (isset($_SERVER['CONTENT_LENGTH'])) {
 				$expected = $_SERVER['CONTENT_LENGTH'];
 				if ($bytesWritten != $expected) {
-					$chunk_handler->cleanup();
+					$chunk_handler->remove($info['index']);
 					throw new Sabre_DAV_Exception_BadRequest(
 						'expected filesize ' . $expected . ' got ' . $bytesWritten);
 				}

lib/private/filechunking.php

@@ -85,6 +85,16 @@ class OC_FileChunking {
 		}
 	}
 
+	/**
+	 * Removes one specific chunk
+	 * @param $index
+	 */
+	public function remove($index) {
+		$cache = $this->getCache();
+		$prefix = $this->getPrefix();
+		$cache->remove($prefix.$index);
+	}
+
 	public function signature_split($orgfile, $input) {
 		$info = unpack('n', fread($input, 2));
 		$blocksize = $info[1];