[metacity] theme-metacity: suppress logically dead code defects

[Alberts Muktupāvels <muktupavels src gnome org>]

commit f22bcf416fab8769126b12a83e9852b2ff3e3497
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Mon Mar 15 00:02:37 2021 +0200

    theme-metacity: suppress logically dead code defects
    
    Coverity CID: #1445656, #1445659

 libmetacity/meta-theme-metacity.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/libmetacity/meta-theme-metacity.c b/libmetacity/meta-theme-metacity.c
index 2161a7ccf..762224835 100644
--- a/libmetacity/meta-theme-metacity.c
+++ b/libmetacity/meta-theme-metacity.c
@@ -3485,6 +3485,7 @@ parse_style_set_element (GMarkupParseContext  *context,
             info->style_set->tiled_right_and_shaded_styles[frame_focus] = frame_style;
             break;
 
+          /* coverity[dead_error_condition] */
           case META_FRAME_STATE_LAST:
           default:
             g_assert_not_reached ();
@@ -5480,6 +5481,7 @@ meta_theme_metacity_draw_frame (MetaThemeImpl           *impl,
           rect = visible_rect;
           break;
 
+        /* coverity[dead_error_condition] */
         case META_FRAME_PIECE_LAST:
         default:
           g_assert_not_reached ();