[PATCH] Avoid using dc in git-count-objects

Using dc is not really necessary, since expr understands summing 32 bit 
signed integers. Which means that git-count-objects will now fail when 2 
GB of unpacked objects have accumulated.

Signed-off-by: Johannes Schindelin <redacted>

---

	This is (again) something I found on a default cygwin setup:
	dc is not installed. I do not even know if you can install
	dc on cygwin without compiling it yourself.

	FYI: I use git-count-objects in t5500-fetch-pack to find out
	if the correct number of objects was fetched.

 git-count-objects.sh |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/git-count-objects.sh b/git-count-objects.sh
index 843d2fd..7f9d8e5 100755
--- a/git-count-objects.sh
+++ b/git-count-objects.sh

@@ -2,12 +2,18 @@
 
 . git-sh-setup
 
+function sum () {
+	local result=0
+	while read line; do
+		result=$(expr $result + $line)
+	done
+	echo $result
+}
+
 echo $(find "$GIT_DIR/objects"/?? -type f -print 2>/dev/null | wc -l) objects, \
 $({
-    echo 0
     # "no-such" is to help Darwin folks by not using xargs -r.
     find "$GIT_DIR/objects"/?? -type f -print 2>/dev/null |
     xargs du -k "$GIT_DIR/objects/no-such" 2>/dev/null |
-    sed -e 's/[ 	].*/ +/'
-    echo p
-} | dc) kilobytes
+    sed -e 's/[ 	].*//'
+} | sum) kilobytes