[metacity] frames: use correct event to suppress defect

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 65e9fbe3e41caa7a34d60dc83471e70eb329547f
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Mar 14 22:24:35 2021 +0200

    frames: use correct event to suppress defect
    
    Coverity CID: #1445650

 src/ui/frames.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/ui/frames.c b/src/ui/frames.c
index e47046f02..68a3729bb 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -1931,7 +1931,7 @@ meta_frames_button_release_event    (GtkWidget           *widget,
         case META_GRAB_OP_KEYBOARD_WORKSPACE_SWITCHING:
           break;
 
-        /* coverity[dead_error_line] */
+        /* coverity[dead_error_begin] */
         case META_GRAB_OP_NONE:
           g_assert_not_reached ();
           break;