[Payments Autofill] Bug fix -- forgot to return after nullptr check.

Bug: 949269
Change-Id: Iedeb559d1f17a1549f8e4120e5968f8dd55e11a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636286Reviewed-by: Jared Saul <jsaul@google.com>
Commit-Queue: Jared Saul <jsaul@google.com>
Commit-Queue: Manas Verma <manasverma@google.com>
Cr-Commit-Position: refs/heads/master@{#664987}

components/autofill/core/browser/payments/credit_card_cvc_authenticator.cc

@@ -23,7 +23,7 @@ void CreditCardCVCAuthenticator::Authenticate(
     const base::TimeTicks& form_parsed_timestamp) {
   requester_ = requester;
   if (!card)
-    OnFullCardRequestFailed();
+    return OnFullCardRequestFailed();
   full_card_request_.reset(new payments::FullCardRequest(
       client_, client_->GetPaymentsClient(), personal_data_manager,
       form_parsed_timestamp));