Address review comments, remove error case and return 0 instead as required by tests

llvm-svn: 249785
diff --git a/llvm/tools/llvm-symbolizer/LLVMSymbolize.cpp b/llvm/tools/llvm-symbolizer/LLVMSymbolize.cpp
index cbfbdda..996520b 100644
--- a/llvm/tools/llvm-symbolizer/LLVMSymbolize.cpp
+++ b/llvm/tools/llvm-symbolizer/LLVMSymbolize.cpp
@@ -128,8 +128,7 @@
 
 uint64_t ModuleInfo::getModulePreferredBase() const {
   if (auto *CoffObject = dyn_cast<COFFObjectFile>(Module))
-    if (auto Base = CoffObject->getImageBase())
-      return Base.get();
+    return CoffObject->getImageBase();
   return 0;
 }