Remove always null argument.

llvm-svn: 242828
diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 6f760ec..44df3a8 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -134,8 +134,7 @@
   std::string FullSymbolName(SymbolName);
 
   bool IsDefault;
-  ErrorOr<StringRef> Version =
-      Obj.getSymbolVersion(nullptr, &*Symbol, IsDefault);
+  ErrorOr<StringRef> Version = Obj.getSymbolVersion(&*Symbol, IsDefault);
   if (Version) {
     FullSymbolName += (IsDefault ? "@@" : "@");
     FullSymbolName += *Version;