Removed explicit NULL checks for shared pointers

and instead made us use implicit casts to bool.
This generated a warning in C++11.

<rdar://problem/11930775>

llvm-svn: 161559

lldb/source/Expression/ClangFunction.cpp

@@ -499,7 +499,7 @@ ClangFunction::ExecuteFunction (
                                                                                  stop_others, 
                                                                                  discard_on_error, 
                                                                                  this_arg));
-    if (call_plan_sp == NULL)
+    if (!call_plan_sp)
         return eExecutionSetupError;
     
     call_plan_sp->SetPrivate(true);