[pango/minor-cleanups: 1/4] pango-view: Fix compiler warnings

[Matthias Clasen <matthiasc src gnome org>]

commit 45e2505f686f6712f8291ff11c488ea0e13e1314
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 12 08:03:01 2022 -0500

    pango-view: Fix compiler warnings

 utils/viewer-render.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/utils/viewer-render.c b/utils/viewer-render.c
index 8816f06f..d5ca5e3e 100644
--- a/utils/viewer-render.c
+++ b/utils/viewer-render.c
@@ -709,6 +709,7 @@ parse_margin (const char *name G_GNUC_UNUSED,
 {
   switch (sscanf (arg, "%d%*[ ,]%d%*[ ,]%d%*[ ,]%d", &opt_margin_t, &opt_margin_r, &opt_margin_b, 
&opt_margin_l))
   {
+    default:
     case 0:
     {
       g_set_error(error,
@@ -718,7 +719,9 @@ parse_margin (const char *name G_GNUC_UNUSED,
       return FALSE;
     }
     case 1: opt_margin_r = opt_margin_t;
+      G_GNUC_FALLTHROUGH;
     case 2: opt_margin_b = opt_margin_t;
+      G_GNUC_FALLTHROUGH;
     case 3: opt_margin_l = opt_margin_r;
   }
   return TRUE;