Exit early on invalid symtab

Author: feedab1e

src/binary-reader.cc

@@ -2341,6 +2341,8 @@ Result BinaryReader::ReadLinkingSection(Offset section_size) {
               CALLBACK(OnSectionSymbol, i, flags, index);
               break;
             }
+            default:
+              ERROR("Unknown symbol type: %d", static_cast<int>(sym_type));
           }
         }
         break;