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Avoid trying to create a/b tree mountpoints multiple times

--- a/export

+++ b/export

@@ -19,6 +19,7 @@

 scratch=/tmp/gitexport.$pid

 mkdir -p $scratch

+mkdir $scratch/a $scratch/b

 for(c in $commits){

 	cp=`{git/query -p $c}

 	pp=`{git/query -p $c'^'}

@@ -26,8 +27,6 @@

 	@{

 		rfork n

 		cd $scratch

-		mkdir a

-		mkdir b

 		bind $pp/tree a

 		bind $cp/tree b