eliminate some clang warnings.


git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@113438 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/API/SBDebugger.cpp b/source/API/SBDebugger.cpp
index 7af3903..d83c65c 100644
--- a/source/API/SBDebugger.cpp
+++ b/source/API/SBDebugger.cpp
@@ -585,7 +585,7 @@
 
     lldb::SettableVariableType var_type;
     StringList value = root_settings_controller->GetVariable (var_name, var_type);
-    for (int i = 0; i < value.GetSize(); ++i)
+    for (unsigned i = 0; i != value.GetSize(); ++i)
         ret_value.AppendString (value.GetStringAtIndex(i));
 
     return ret_value;