[mutter/wip/carlosg/coverity-fixes: 2/12] compositor: Remove dead code

[Carlos Garnacho <carlosg src gnome org>]

commit 6fcc69062a9373f454beaa11e39eaa4d48aa7d09
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Oct 24 20:00:38 2021 +0200

    compositor: Remove dead code
    
    When grabbing the devices, there's no error paths that would quit
    late enough that both pointer and keyboard would need ungrabbing,
    so the keyboard checks were dead code.
    
    Fix this by dropping the boolean variable checks, and adding goto
    labels to unroll the operation properly at every stage.
    
    CID: #1418254

 src/compositor/compositor.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)
---
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index 9cdd39c15d..ee6be007b8 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -353,33 +353,24 @@ grab_devices (MetaModalOptions  options,
               guint32           timestamp)
 {
   MetaBackend *backend = META_BACKEND (meta_get_backend ());
-  gboolean pointer_grabbed = FALSE;
-  gboolean keyboard_grabbed = FALSE;
 
   if ((options & META_MODAL_POINTER_ALREADY_GRABBED) == 0)
     {
       if (!meta_backend_grab_device (backend, META_VIRTUAL_CORE_POINTER_ID, timestamp))
         goto fail;
-
-      pointer_grabbed = TRUE;
     }
 
   if ((options & META_MODAL_KEYBOARD_ALREADY_GRABBED) == 0)
     {
       if (!meta_backend_grab_device (backend, META_VIRTUAL_CORE_KEYBOARD_ID, timestamp))
-        goto fail;
-
-      keyboard_grabbed = TRUE;
+        goto ungrab_pointer;
     }
 
   return TRUE;
 
+ ungrab_pointer:
+  meta_backend_ungrab_device (backend, META_VIRTUAL_CORE_POINTER_ID, timestamp);
  fail:
-  if (pointer_grabbed)
-    meta_backend_ungrab_device (backend, META_VIRTUAL_CORE_POINTER_ID, timestamp);
-  if (keyboard_grabbed)
-    meta_backend_ungrab_device (backend, META_VIRTUAL_CORE_KEYBOARD_ID, timestamp);
-
   return FALSE;
 }