Fix build with -DENABLE_GPU_PROCESS=ON in RemoteGraphicsContextGLProx…

…yGBM

https://bugs.webkit.org/show_bug.cgi?id=265029

Unreviewed Build Fix.

Fixes a no match for 'operator!' error since the sendResult is now a
'IPC::ConnectionSendSyncResult<Messages::RemoteGraphicsContextGL::PrepareForDisplay>')

* Source/WebKit/WebProcess/GPU/graphics/gbm/RemoteGraphicsContextGLProxyGBM.cpp:
(WebKit::RemoteGraphicsContextGLProxyGBM::prepareForDisplay):

Canonical link: https://commits.webkit.org/270962@main

Source/WebKit/WebProcess/GPU/graphics/gbm/RemoteGraphicsContextGLProxyGBM.cpp

@@ -128,7 +128,7 @@ void RemoteGraphicsContextGLProxyGBM::prepareForDisplay()
         return;
 
     auto sendResult = sendSync(Messages::RemoteGraphicsContextGL::PrepareForDisplay());
-    if (!sendResult) {
+    if (!sendResult.succeeded()) {
         markContextLost();
         return;
     }