llvm-objdump: Don't ignore errors from raw_fd_ostream.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135787 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-objdump/llvm-objdump.cpp b/tools/llvm-objdump/llvm-objdump.cpp
index 2efdc0d..c1e35cd 100644
--- a/tools/llvm-objdump/llvm-objdump.cpp
+++ b/tools/llvm-objdump/llvm-objdump.cpp
@@ -272,6 +272,10 @@
         // Start a new dot file.
         std::string Error;
         raw_fd_ostream Out((f.getName().str() + ".dot").c_str(), Error);
+        if (!Error.empty()) {
+          errs() << ToolName << ": warning: " << Error << '\n';
+          continue;
+        }
 
         Out << "digraph " << f.getName() << " {\n";
         Out << "graph [ rankdir = \"LR\" ];\n";