[BUG] gitk fails with argument that is both existing directory and branch name

Hello,

I have a branch named fixes in my linux repo and until I did:

	git format-patch -o fixes linus/master 

the following command worked fine:
	
	gitk ^linus/master fixes

but now that there is a directory named fixes, nothing happens when running gitk. With rev-list I get

	zeisberg@cassiopeia:~/gsrc/linux-2.6$ git rev-list ^linus/master fixes
	fatal: ambiguous argument 'fixes': both revision and filename
	Use '--' to separate filenames from revisions

but 
	
	gitk ^linus/master fixes --

doesn't work either. I'd suspect that the call to rev-list doesn't see the "--" and the error is lost somewhere inbetween ...?

I currently have no time to look into it, so for now you only get a report.

Best regards Uwe