crypto: n2 - Remove return statement from void function

Return statement at the end of a void function is useless.

The Coccinelle semantic patch used to make this change is as follows:
//<smpl>
@@
identifier f;
expression e;
@@
void f(...) {
<...
- return
  e;
...>
}
//</smpl>

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/n2_core.c b/drivers/crypto/n2_core.c
index b85a7a7..c5aac25 100644
--- a/drivers/crypto/n2_core.c
+++ b/drivers/crypto/n2_core.c
@@ -1598,7 +1598,7 @@
 
 static void free_queue(void *p, unsigned long q_type)
 {
-	return kmem_cache_free(queue_cache[q_type - 1], p);
+	kmem_cache_free(queue_cache[q_type - 1], p);
 }
 
 static int queue_cache_init(void)