[sftp] use qEnvironmentVariableIntValue instead of manual atoi checking

Authored by sitter on Sep 13 2018, 12:11 PM.

Description

[sftp] use qEnvironmentVariableIntValue instead of manual atoi checking

Summary: it's the Qt way of doing this

Reviewers: broulik

Reviewed By: broulik

Differential Revision: https://phabricator.kde.org/D15477

Details