Fix bug found by warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152812 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Object/COFFObjectFile.cpp b/lib/Object/COFFObjectFile.cpp
index fe22242..22894a3 100644
--- a/lib/Object/COFFObjectFile.cpp
+++ b/lib/Object/COFFObjectFile.cpp
@@ -311,7 +311,8 @@
   // Check for string table entry. First byte is '/'.
   if (name[0] == '/') {
     uint32_t Offset;
-    name.substr(1).getAsInteger(10, Offset);
+    if (name.substr(1).getAsInteger(10, Offset))
+      return object_error::parse_failed;
     if (error_code ec = getString(Offset, name))
       return ec;
   }