We should not pass --prefix NULL into the helper. Although the helper
can deal with it, it's just messy.

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 git-submodule.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-submodule.sh b/git-submodule.sh
index 7ef3247..3ccb0b6 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -700,7 +700,7 @@ Maybe you want to use 'update --init'?")"
 
                if ! test -d "$sm_path"/.git && ! test -f "$sm_path"/.git
                then
-                       git submodule--helper clone ${GIT_QUIET:+--quiet} 
--prefix "$prefix" --path "$sm_path" --name "$name" --url "$url" "$reference" 
"$depth" || exit
+                       git submodule--helper clone ${GIT_QUIET:+--quiet} 
${prefix:+--prefix "$prefix"} --path "$sm_path" --name "$name" --url "$url" 
"$reference" "$depth" || exit
                        cloned_modules="$cloned_modules;$name"
                        subsha1=
                else
-- 
2.6.0.rc0.131.gf624c3d

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