Wuthout this fix, it had always tried to replace in original path,
thus second occurence of double path delimiter, like in
C:\dir1\\dir2\dir3\\file
would result in invalid path reported.

Change-Id: I63ce97b620229601e18f10016a759275aceeec4d
Reviewed-on: https://gerrit.libreoffice.org/44675Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Jenkins <ci@libreoffice.org>