crypto: seqiv - Fix module unload/reload crash

On module unload we weren't unregistering the seqniv template,
thus leading to a crash the next time someone walks the template
list.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/seqiv.c

@@ -874,6 +874,7 @@ static int __init seqiv_module_init(void)
 
 static void __exit seqiv_module_exit(void)
 {
+	crypto_unregister_template(&seqniv_tmpl);
 	crypto_unregister_template(&seqiv_tmpl);
 }