Remove usage of xargs -r, a non-portable gnu extension.

Signed-off-by: Bryan Larsen <[EMAIL PROTECTED]>
---

 git-prune-script |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/git-prune-script b/git-prune-script
--- a/git-prune-script
+++ b/git-prune-script
@@ -20,6 +20,6 @@ sed -ne '/unreachable /{
     s|\(..\)|\1/|p
 }' | {
        cd "$GIT_OBJECT_DIRECTORY" || exit
-       xargs -r $dryrun rm -f
+       xargs $dryrun rm -f ""
 }
 
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