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git/revert: handle absolute paths gracefully (thanks deuteron)

when reverting files, absolute paths would get concatenated with
$gitrel; use `cleanname -d` to fix this.

--- a/sys/src/cmd/git/revert

+++ b/sys/src/cmd/git/revert

@@ -11,9 +11,10 @@

 if(~ $#query 1)

 	commit=`{git/query -p $query}

-for(f in `$nl{cd $commit/tree/ && walk -f ./$gitrel/$*}){

+files=`$nl{cleanname -d $gitrel $*}

+for(f in `$nl{cd $commit/tree/ && walk -f $files}){

 	mkdir -p `{basename -d $f}

-	cp -- $commit/tree/$f $f

+	cp -x -- $commit/tree/$f $f

 	git/add $f

 }

 exit ''

-- 

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