submodule--helper run-update-procedure: remove --suboid

Teach run-update-procedure to determine the oid of the submodule's HEAD
instead of doing it in git-submodule.sh.

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -406,14 +406,9 @@ cmd_update()
 
 		displaypath=$(git submodule--helper relative-path "$prefix$sm_path" "$wt_prefix")
 
-		if test $just_cloned -eq 1
+		if test $just_cloned -eq 0
 		then
-			subsha1=
-		else
 			just_cloned=
-			subsha1=$(sanitize_submodule_env; cd "$sm_path" &&
-				git rev-parse --verify HEAD) ||
-			die "fatal: $(eval_gettext "Unable to find current revision in submodule path '\$displaypath'")"
 		fi
 
 		if test -n "$remote"
@@ -441,7 +436,6 @@ cmd_update()
 			  ${update:+--update "$update"} \
 			  ${prefix:+--recursive-prefix "$prefix"} \
 			  ${sha1:+--oid "$sha1"} \
-			  ${subsha1:+--suboid "$subsha1"} \
 			  "--" \
 			  "$sm_path")