net: sched: Fill in MODULE_DESCRIPTION for act_gate

W=1 builds now warn if module is built without a MODULE_DESCRIPTION().

Gate is the only TC action that is lacking such description.
Fill MODULE_DESCRIPTION for Gate TC ACTION.

Signed-off-by: Victor Nogueira <[email protected]>
Acked-by: Jamal Hadi Salim <[email protected]>
Reviewed-by: Vinicius Costa Gomes <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: vbnogueira

net/sched/act_gate.c

@@ -677,4 +677,5 @@ static void __exit gate_cleanup_module(void)
 
 module_init(gate_init_module);
 module_exit(gate_cleanup_module);
+MODULE_DESCRIPTION("TC gate action");
 MODULE_LICENSE("GPL v2");