module: Fix gratuitous sprintf in module.c

Andrew sent an older version of this patch: we shouldn't use sprintf
to copy a string.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/kernel/module.c b/kernel/module.c
index 1731469..276abd7 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -738,7 +738,7 @@
 		mutex_lock(&module_mutex);
 	}
 	/* Store the name of the last unloaded module for diagnostic purposes */
-	sprintf(last_unloaded_module, mod->name);
+	strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
 	free_module(mod);
 
  out: