Always set 'from_file' and 'to_file' keys when parsing raw diff output
format line, even if filename didn't change (file was not renamed).
This allows for less code (and no problems with file named '0'); use
this.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
---
This simplifies code a bit _and_ fortifies gitweb against filenames
like '0' (although it does remove _fragments_ of lines, not lines
themselves, so it is not visible in diffstat).

 gitweb/gitweb.perl |   17 ++++++++++-------
 1 files changed, 10 insertions(+), 7 deletions(-)