Frees the orig variable in the path_split function

Signed-off-by: johnstevenson <john-stevenson@blueyonder.co.uk>
Style-cleanup

Signed-off-by: johnstevenson <john-stevenson@blueyonder.co.uk>
Merge pull request #16 from johnstevenson/winexec2

Memory-leak fix and code formatting in winexec.c