crypto: stat - remove unused mutex

crypto_cfg_mutex in crypto_user_stat.c is unused.  Remove it.

Cc: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/crypto_user_stat.c

@@ -20,8 +20,6 @@
 
 #define null_terminated(x)	(strnlen(x, sizeof(x)) < sizeof(x))
 
-static DEFINE_MUTEX(crypto_cfg_mutex);
-
 struct crypto_dump_info {
 	struct sk_buff *in_skb;
 	struct sk_buff *out_skb;