tools: fix invalid printing, buffer overrun in llvm-readobj

All auxiliary records are consumed when accessing a File record.

llvm-svn: 206354
diff --git a/llvm/tools/llvm-readobj/COFFDumper.cpp b/llvm/tools/llvm-readobj/COFFDumper.cpp
index 8d08d02..48edf78 100644
--- a/llvm/tools/llvm-readobj/COFFDumper.cpp
+++ b/llvm/tools/llvm-readobj/COFFDumper.cpp
@@ -981,6 +981,7 @@
       StringRef Name(Aux->FileName,
                      Symbol->NumberOfAuxSymbols * COFF::SymbolSize);
       W.printString("FileName", Name.rtrim(StringRef("\0", 1)));
+      break;
     } else if (Symbol->isSectionDefinition()) {
       const coff_aux_section_definition *Aux;
       if (error(getSymbolAuxData(Obj, Symbol + I, Aux)))