builtin/merge.c: drop a parameter that is never used

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 51563840f49089cf250992fd47fe70a45cef0c52..24bb1ab9929d2cbf117051ed0e4edeb37b0efaea 100755 (executable)
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -263,6 +263,17 @@ sub get_empty_tree {
        return '4b825dc642cb6eb9a060e54bf8d69288fbee4904';
 }
 
+sub get_diff_reference {
+       my $ref = shift;
+       if (defined $ref and $ref ne 'HEAD') {
+               return $ref;
+       } elsif (is_initial_commit()) {
+               return get_empty_tree();
+       } else {
+               return 'HEAD';
+       }
+}
+
 # Returns list of hashes, contents of each of which are:
 # VALUE:       pathname
 # BINARY:      is a binary path
@@ -286,14 +297,7 @@ sub list_modified {
                return if (!@tracked);
        }
 
-       my $reference;
-       if (defined $patch_mode_revision and $patch_mode_revision ne 'HEAD') {
-               $reference = $patch_mode_revision;
-       } elsif (is_initial_commit()) {
-               $reference = get_empty_tree();
-       } else {
-               $reference = 'HEAD';
-       }
+       my $reference = get_diff_reference($patch_mode_revision);
        for (run_cmd_pipe(qw(git diff-index --cached
                             --numstat --summary), $reference,
                             '--', @tracked)) {
@@ -737,7 +741,7 @@ sub parse_diff {
                splice @diff_cmd, 1, 0, "--diff-algorithm=${diff_algorithm}";
        }
        if (defined $patch_mode_revision) {
-               push @diff_cmd, $patch_mode_revision;
+               push @diff_cmd, get_diff_reference($patch_mode_revision);
        }
        my @diff = run_cmd_pipe("git", @diff_cmd, "--", $path);
        my @colored = ();