cleanup: Drop pointless return at end of function

A few functions now end with a label.  The next commit will clean them
up.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250407082643.2310002-3-armbru@redhat.com>
[Straightforward conflict with commit 988ad4cceb (hw/loongarch/virt:
Fix cpuslot::cpu set at last in virt_cpu_plug()) resolved]

ui/input-linux.c

@@ -412,7 +412,6 @@ err_read_event_bits:
 
 err_close:
     close(il->fd);
-    return;
 }
 
 static void input_linux_instance_finalize(Object *obj)