Master Branch update inc/nginx_patch.inc check directory before pushd/popd

update inc/nginx_patch.inc check directory before pushd/popd

https://community.centminmod.com/threads/upgrade-failed.11501/#post-48919

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Centmin Mod Github Master branch

Master branch is where most recent commits are made as at May 24, 2015.

• Branch: https://github.com/centminmod/centminmod
• Commit History: https://github.com/centminmod/centminmod/commits/master