return earlier, no logic change intended

Change-Id: Icd75c46eb57c059fb60fd9701e6bb1fb651d8f3f

vcl/source/gdi/impgraph.cxx

@@ -1520,10 +1520,15 @@ void ReadImpGraphic( SvStream& rIStm, ImpGraphic& rImpGraphic )
 
 void WriteImpGraphic(SvStream& rOStm, const ImpGraphic& rImpGraphic)
 {
-    if( !rOStm.GetError() )
-    {
-        if( !rImpGraphic.ImplIsSwapOut() )
+    if (rOStm.GetError())
+        return;
+
+    if (rImpGraphic.ImplIsSwapOut())
     {
+        rOStm.SetError( SVSTREAM_GENERALERROR );
+        return;
+    }
+
     if( ( rOStm.GetVersion() >= SOFFICE_FILEFORMAT_50 ) &&
         ( rOStm.GetCompressMode() & SvStreamCompressFlags::NATIVE ) &&
         rImpGraphic.mpGfxLink && rImpGraphic.mpGfxLink->IsNative() &&
@@ -1597,10 +1602,6 @@ void WriteImpGraphic(SvStream& rOStm, const ImpGraphic& rImpGraphic)
 
         rOStm.SetEndian( nOldFormat );
     }
-        }
-        else
-             rOStm.SetError( SVSTREAM_GENERALERROR );
-    }
 }
 
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