Reduce the scope of variables using to index single loop only.

And adjust their types if necessary.

src/propgrid/propgridiface.cpp

@@ -452,8 +452,7 @@ void wxPropertyGridInterface::DoSetPropertyAttribute( wxPGPropArg id, const wxSt
 
     if ( argFlags & wxPG_RECURSE )
     {
-        unsigned int i;
-        for ( i = 0; i < p->GetChildCount(); i++ )
+        for ( unsigned int i = 0; i < p->GetChildCount(); i++ )
             DoSetPropertyAttribute(p->Item(i), name, value, argFlags);
     }
 }