Fix lint: remove trailing whitespace on empty line

src/compiler/checker.ts

@@ -7981,7 +7981,7 @@ namespace ts {
                 // get the original type -- represented as the type constraint of the this type
                 type = getConstraintOfTypeParameter(<TypeParameter>type);
             }
-            
+
             // TODO: why is the first part of this check here?
             if (!(getTargetType(type).flags & (TypeFlags.Class | TypeFlags.Interface) && hasBaseType(<InterfaceType>type, enclosingClass))) {
                 error(node, Diagnostics.Property_0_is_protected_and_only_accessible_through_an_instance_of_class_1, symbolToString(prop), typeToString(enclosingClass));