llvm-readobj: Check for null section pointer

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180006 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-readobj/COFFDumper.cpp b/tools/llvm-readobj/COFFDumper.cpp
index 56885c6..14f8b72 100644
--- a/tools/llvm-readobj/COFFDumper.cpp
+++ b/tools/llvm-readobj/COFFDumper.cpp
@@ -799,7 +799,7 @@
       W.printEnum("Selection", Aux->Selection, makeArrayRef(ImageCOMDATSelect));
       W.printBinary("Unused", makeArrayRef(Aux->Unused));
 
-      if (Section->Characteristics & COFF::IMAGE_SCN_LNK_COMDAT
+      if (Section && Section->Characteristics & COFF::IMAGE_SCN_LNK_COMDAT
           && Aux->Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) {
         const coff_section *Assoc;
         StringRef AssocName;