git-branch: remove D/F check done by hand.

Now ref creation codepath in lock_ref_sha1() and friends notices
the directory/file conflict situation, we do not do this by hand
in git-branch anymore.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

git-branch.sh

@@ -121,16 +121,6 @@ then
 	done
 fi
 
-branchdir=$(dirname $branchname)
-while test "$branchdir" != "."
-do
-	if git-show-ref --verify --quiet -- "refs/heads/$branchdir"
-	then
-		die "$branchdir already exists."
-	fi
-	branchdir=$(dirname $branchdir)
-done
-
 prev=''
 if git-show-ref --verify --quiet -- "refs/heads/$branchname"
 then