Fix a use-after-free error in switch binding

sway/commands/bind.c

@@ -608,6 +608,7 @@ void seat_execute_command(struct sway_seat *seat, struct sway_binding *binding)
 			return;
 		}
 		memcpy(deferred, binding, sizeof(struct sway_binding));
+		deferred->command = strdup(binding->command);
 		list_add(seat->deferred_bindings, deferred);
 		return;
 	}

sway/input/switch.c

@@ -1,4 +1,3 @@
-#define _POSIX_C_SOURCE 200809L
 #include "sway/config.h"
 #include "sway/desktop/transaction.h"
 #include "sway/input/switch.h"
@@ -57,7 +56,7 @@ static void execute_binding(struct sway_switch *sway_switch) {
 			calloc(1, sizeof(struct sway_binding));
 		dummy_binding->type = BINDING_SWITCH;
 		dummy_binding->flags = matched_binding->flags;
-		dummy_binding->command = strdup(matched_binding->command);
+		dummy_binding->command = matched_binding->command;
 
 		seat_execute_command(seat, dummy_binding);
 		free(dummy_binding);