Wrong warning "Insufficient storage space available" for accounts without quota

[kesselb]

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Steps to reproduce

1. Have a user with unlimited quota
2. Visita user migration page
3. See warning

Expected behaviour

No warning ;)

Actual behaviour

Warning

Insufficient storage space available, please free up 4.28515625 MiB or more to be able to export your data without running out of space

Cause

user_migration/lib/Service/UserMigrationService.php

Lines 116 to 117 in 0e1a948

	$userFolder = $this->rootFolder->getUserFolder($user->getUID());
	$freeSpace = ceil($userFolder->getFreeSpace() / 1024);

getFreeSpace might return -1, -2 or -3 (see https://github.com/nextcloud/server/blob/35606bc6bd6d4fb79aab42088ad8ecdb7f0e1402/lib/public/Files/FileInfo.php#L29-L43)