Wrong error message when failling to move a folder

reactos-bootcd-0.4.15-dev-7374-g88107ad-x86-gcc-lin-dbg

• Open "MyComputer"
• Drop'n'drop "C:" drive onto Desktop:

Error message is supposed to indicate the failing path as per : IDS_MOVEERRORSUBFOLDER where %s is replaced by feFrom->szFilename in validate_operation here https://git.reactos.org/?p=reactos.git;a=blob;f=dll/win32/shell32/shlfileop.cpp;hb=6c93f3ca6b95fa5e1806fc29295d3bc8ada979f9#l2010 

Note : Same with "same path"

This is due to the case in add_file_to_entry where only feFile->szFullPath gets populated but neither feFile->szDirectory nor feFile->szFilename due to ptr being null, which is the expected case for "C:\" path.

Fixed by copyerrorfix.patch