completion: fix zsh check under bash with 'set -u'

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index eb2dff55f81b6726340ce26db93bb161087a4857..a27952d9fdfb517f684b7d304831bf74d0ce237b 100755 (executable)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -626,7 +626,7 @@ skip_unnecessary_picks () {
                case "$fd,$command" in
                3,pick|3,p)
                        # pick a commit whose parent is current $ONTO -> skip
-                       sha1=$(printf '%s' "$rest" | cut -d ' ' -f 1)
+                       sha1=${rest%% *}
                        case "$(git rev-parse --verify --quiet "$sha1"^)" in
                        "$ONTO"*)
                                ONTO=$sha1