[C++11] More 'nullptr' conversion or in some cases just using a boolean check instead of comparing to nullptr.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206129 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/ELFObjectWriter.cpp

@@ -509,8 +509,8 @@ uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &OrigData,
       Symbol = &A->getSymbol();
       Data = &Layout.getAssembler().getSymbolData(*Symbol);
     } else {
-      Symbol = 0;
-      Data = 0;
+      Symbol = nullptr;
+      Data = nullptr;
     }
   }