Update path_from_format.rs

Author: merelymyself

clippy_lints/src/path_from_format.rs

@@ -36,7 +36,7 @@ impl<'tcx> LateLintPass<'tcx> for PathFromFormat {
             if let ExprKind::Call(_, ref args) = expr.kind;
             if let ty = cx.typeck_results().expr_ty(expr);
             if is_type_diagnostic_item(cx, ty, sym::PathBuf);
-            if args.len() == 0;
+            if args.len() > 0;
             if let Some(macro_def_id) = args[0].span.ctxt().outer_expn_data().macro_def_id;
             if cx.tcx.get_diagnostic_name(macro_def_id) == Some(sym::format_macro);
             then {