be careful with priority of ? operator

AMDiS/src/io/detail/VtkWriter.cc

@@ -250,7 +250,7 @@ namespace AMDiS  { namespace io {
 	      << "    </PCells>\n";
 	  file << "    <PPointData>\n";
 	  
-	  for (size_t i = 0; i < writeAsVector ? 1 : componentNames.size(); i++) {
+	  for (size_t i = 0; i < (writeAsVector ? 1 : componentNames.size()); i++) { 
 	    if(highPrecision && format != ::AMDiS::io::VtkWriter::ASCII)
 	      file << "      <PDataArray type=\"Float64\" Name=\"";
 	    else