AthenaKernel: Coverity 118547.

Fix coverity warning: shadowed parameter.

Control/AthenaKernel/AthenaKernel/MetaCont.h

@@ -193,9 +193,8 @@ bool MetaCont<T>::find(const SourceID& it, T*& t) const {
     return true;
   }
   else {
-    typename MetaContSet::const_iterator it=m_metaSet.begin();
-    for (; it != m_metaSet.end(); ++it) {
-      std::cerr << "Container has SID=" << it->first << std::endl;
+    for (const auto& elt : m_metaSet) {
+      std::cerr << "Container has SID=" << elt.first << std::endl;
     }
   }