[Curl] Suppress warning of unused enum value in switch statement.

https://bugs.webkit.org/show_bug.cgi?id=240672

Reviewed by Fujii Hironori.

Just after the request object creation, the state is WaitingForStart. It is better
the code explicitly takes care of this fact. Also moving the assignment to the state
inside the switch statement denotes the state is changing to the response of previous
state.

No new tests. Covered by existing tests.

* platform/network/curl/CurlRequest.cpp:
(WebCore::CurlRequest::start):

Canonical link: https://commits.webkit.org/250766@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@294509 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/platform/network/curl/CurlRequest.cpp

@@ -116,10 +116,11 @@ void CurlRequest::start()
         [[fallthrough]];
     case StartState::StartSuspended:
         return;
+    case StartState::WaitingForStart:
+        m_startState = StartState::DidStart;
+        break;
     }
 
-    m_startState = StartState::DidStart;
-
     if (m_request.url().isLocalFile())
         invokeDidReceiveResponseForFile(m_request.url());
     else