op-challenger: Fix lint.

op-e2e/e2eutils/disputegame/helper.go

@@ -166,6 +166,7 @@ func (h *FactoryHelper) StartOutputCannonGame(ctx context.Context, rollupEndpoin
 	h.require.NoError(err)
 
 	rollupClient, err := dial.DialRollupClientWithTimeout(ctx, 30*time.Second, testlog.Logger(h.t, log.LvlInfo), rollupEndpoint)
+	h.require.NoError(err)
 
 	return &OutputCannonGameHelper{
 		FaultGameHelper: FaultGameHelper{

op-e2e/e2eutils/disputegame/output_cannon_helper.go

@@ -44,6 +44,7 @@ func (g *OutputCannonGameHelper) WaitForCorrectOutputRoot(ctx context.Context, c
 	g.WaitForClaimCount(ctx, claimIdx+1)
 	claim := g.getClaim(ctx, claimIdx)
 	err, blockNum := g.blockNumForClaim(ctx, claim)
+	g.require.NoError(err)
 	output, err := g.rollupClient.OutputAtBlock(ctx, blockNum)
 	g.require.NoErrorf(err, "Failed to get output at block %v", blockNum)
 	g.require.EqualValuesf(output.OutputRoot, claim.Claim, "Incorrect output root at claim %v. Expected to be from block %v", claimIdx, blockNum)