git-checkout.sh: use "mkdir -p"

Otherwise mkdir extras/mini-os fails because extras doesn't exist.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

scripts/git-checkout.sh

@@ -13,7 +13,7 @@ set -e
 
 if test \! -d $DIR-remote; then
 	rm -rf $DIR-remote $DIR-remote.tmp
-	mkdir $DIR-remote.tmp; rmdir $DIR-remote.tmp
+	mkdir -p $DIR-remote.tmp; rmdir $DIR-remote.tmp
 	$GIT clone $TREE $DIR-remote.tmp
 	if test "$TAG" ; then
 		cd $DIR-remote.tmp