Bug 1724830 - Lint fix. a=lint-fix

                if mozpath.split(base)[0] == "res":

                    has_resources = True

                for f in files:

                    if var in (

                    if (

                        var

                        in (

                            "FINAL_TARGET_PP_FILES",

                            "OBJDIR_PP_FILES",

                            "LOCALIZED_PP_FILES",

                    ) and not isinstance(f, SourcePath):

                        )

                        and not isinstance(f, SourcePath)

                    ):

                        raise SandboxValidationError(

                            ("Only source directory paths allowed in " + "%s: %s")

                            % (var, f),