git-merge: fix faulty SQUASH_MSG

Only the first 'remote' head is currently specified as an argument to 'git
log' when generating a SQUSH_MSG, which makes the generated message fail
to mention every commit involved in the merge. This fixes the problem.

Noticed-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-merge.sh

diff --git a/git-merge.sh b/git-merge.sh
index cde09d4..919e6be 100755
--- a/git-merge.sh
+++ b/git-merge.sh
@@ -59,7 +59,7 @@
 squash_message () {
 	echo Squashed commit of the following:
 	echo
-	git log --no-merges ^"$head" $remote
+	git log --no-merges ^"$head" $remoteheads
 }
 
 finish () {