git-debrebase: begin_convert_from: Break out $gdrlast_obj

NFC

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 3 insertions, 1 deletions

diff --git a/git-debrebase b/git-debrebase
index d80c8d3..af19583 100755
--- a/git-debrebase
+++ b/git-debrebase
@@ -2416,9 +2416,11 @@ sub begin_convert_from () {
 
     fail "ffq-prev exists, this is already managed by git-debrebase!"
 	if $ffq_prev && git_get_ref $ffq_prev;
+
+    my $gdrlast_obj = $gdrlast && git_get_ref $gdrlast;
     snag 'already-converted',
 	"ahead of debrebase-last, this is already managed by git-debrebase!"
-	if $gdrlast && git_get_ref $gdrlast && is_fast_fwd $gdrlast, $head;
+	if $gdrlast_obj && is_fast_fwd $gdrlast_obj, $head;
     return ($head, undef);
 }