[gnome-panel] fish: check return value

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 008ebb436429e2b19f5bc6193b146ce9b329cdf7
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Mar 3 14:34:44 2022 +0200

    fish: check return value
    
    Coverity CID: #1502711

 modules/fish/fish-applet.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/modules/fish/fish-applet.c b/modules/fish/fish-applet.c
index 0db45a8f9..54e061b24 100644
--- a/modules/fish/fish-applet.c
+++ b/modules/fish/fish-applet.c
@@ -531,7 +531,8 @@ set_environment (gpointer user_data)
 
        display = gdk_display_get_default ();
 
-       g_setenv ("DISPLAY", gdk_display_get_name (display), TRUE);
+       if (!g_setenv ("DISPLAY", gdk_display_get_name (display), TRUE))
+               g_warning ("Failed to set DISPLAY environment variable");
 }
 
 static void