don't increment fork acount for reparented fork

it's already set

Author: AdamMajer

services/repository/fork.go

@@ -115,9 +115,6 @@ func ForkRepository(ctx context.Context, doer, owner *user_model.User, opts Fork
 			if err = repo_model.ReparentFork(ctx, repo.ID, opts.BaseRepo.ID); err != nil {
 				return err
 			}
-			if err = repo_model.IncrementRepoForkNum(ctx, repo.ID); err != nil {
-				return err
-			}
 		} else {
 			if err = repo_model.IncrementRepoForkNum(ctx, opts.BaseRepo.ID); err != nil {
 				return err

tests/integration/repo_fork_test.go

@@ -163,6 +163,8 @@ func TestAPICreateForkWithReparent(t *testing.T) {
 	assert.False(t, forked.IsFork)
 	assert.Equal(t, forked.ID, orig.ForkID)
 	assert.True(t, orig.IsFork)
+	assert.Equal(t, 1, forked.NumForks)
+	assert.Equal(t, 0, orig.NumForks)
 }
 
 func TestAPICreateForkWithoutReparent(t *testing.T) {
@@ -194,4 +196,6 @@ func TestAPICreateForkWithoutReparent(t *testing.T) {
 	assert.True(t, forked.IsFork)
 	assert.Equal(t, int64(0), orig.ForkID)
 	assert.False(t, orig.IsFork)
+	assert.Equal(t, 0, forked.NumForks)
+	assert.Equal(t, 1, orig.NumForks)
 }