loplugin:flatten in opencl

Change-Id: I9f45510eddb022013af751d232d4704432717ef6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/91617
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

opencl/source/OpenCLZone.cxx

@@ -25,8 +25,9 @@ void OpenCLZone::hardDisable()
 {
     // protect ourselves from double calling etc.
     static bool bDisabled = false;
-    if (!bDisabled)
-    {
+    if (bDisabled)
+        return;
+
     bDisabled = true;
 
     std::shared_ptr<comphelper::ConfigurationChanges> xChanges(comphelper::ConfigurationChanges::create());
@@ -40,6 +41,5 @@ void OpenCLZone::hardDisable()
 
     releaseOpenCLEnv(&openclwrapper::gpuEnv);
 }
-}
 
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