[llvm-readobj/llvm-readelf] - Report a warning instead of a error when dumping a broken dynamic section.

It does not make sence to stop dumping the object if the broken
dynamic section was found. In this patch I changed the behavior from
"report an error" to "report a warning". This matches GNU.

Differential revision: https://reviews.llvm.org/D64472

llvm-svn: 365762
diff --git a/llvm/tools/llvm-readobj/llvm-readobj.cpp b/llvm/tools/llvm-readobj/llvm-readobj.cpp
index 31e8bbe..f00d94e 100644
--- a/llvm/tools/llvm-readobj/llvm-readobj.cpp
+++ b/llvm/tools/llvm-readobj/llvm-readobj.cpp
@@ -377,6 +377,7 @@
 }
 
 void reportWarning(Twine Msg) {
+  fouts().flush();
   errs() << "\n";
   WithColor::warning(errs()) << Msg << "\n";
 }