'l' length modifier has no effect on 'f'

See §7.19.6.1-7.
diff --git a/src/ziptool.c b/src/ziptool.c
index cb3d27f..1c87e2c 100644
--- a/src/ziptool.c
+++ b/src/ziptool.c
@@ -396,7 +396,7 @@
 
 static void
 progress_callback(zip_t *archive, double percentage, void *ud) {
-    printf("%.1lf%% done\n", percentage * 100);
+    printf("%.1f%% done\n", percentage * 100);
     progress_userdata.percentage = percentage;
 }