MC: Remove implicit ilist iterator conversions, NFC

llvm-svn: 249922
diff --git a/llvm/lib/MC/MCObjectStreamer.cpp b/llvm/lib/MC/MCObjectStreamer.cpp
index 992b2cf..0da61b5 100644
--- a/llvm/lib/MC/MCObjectStreamer.cpp
+++ b/llvm/lib/MC/MCObjectStreamer.cpp
@@ -94,7 +94,7 @@
   assert(getCurrentSectionOnly() && "No current section!");
 
   if (CurInsertionPoint != getCurrentSectionOnly()->getFragmentList().begin())
-    return std::prev(CurInsertionPoint);
+    return &*std::prev(CurInsertionPoint);
 
   return nullptr;
 }