sweep up -Wformat warnings from gcc

This is a purely mechanical change explicitly casting any parameters for printf
style conversion.  This cleans up the warnings emitted by gcc 4.8 on Linux.

llvm-svn: 205607
diff --git a/lldb/source/Symbol/Variable.cpp b/lldb/source/Symbol/Variable.cpp
index 36fe3b1..2314da5 100644
--- a/lldb/source/Symbol/Variable.cpp
+++ b/lldb/source/Symbol/Variable.cpp
@@ -93,7 +93,7 @@
 void
 Variable::Dump(Stream *s, bool show_context) const
 {
-    s->Printf("%p: ", this);
+    s->Printf("%p: ", static_cast<const void*>(this));
     s->Indent();
     *s << "Variable" << (const UserID&)*this;