llvm-readobj: Do not print NULL StringRefs

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180005 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-readobj/MachODumper.cpp b/tools/llvm-readobj/MachODumper.cpp
index 54de49c..10e53d9 100644
--- a/tools/llvm-readobj/MachODumper.cpp
+++ b/tools/llvm-readobj/MachODumper.cpp
@@ -406,12 +406,11 @@
   MachOSymbol Symbol;
   getSymbol(Obj, SymI->getRawDataRefImpl(), Symbol);
 
-  StringRef SectionName;
+  StringRef SectionName = "";
   section_iterator SecI(Obj->end_sections());
-  if (error(SymI->getSection(SecI)) ||
-      SecI == Obj->end_sections() ||
-      error(SecI->getName(SectionName)))
-    SectionName = "";
+  if (!error(SymI->getSection(SecI)) &&
+      SecI != Obj->end_sections())
+      error(SecI->getName(SectionName));
 
   DictScope D(W, "Symbol");
   W.printNumber("Name", SymbolName, Symbol.StringIndex);