crypto: atmel - remove set but not used variable 'alg_name'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/crypto/atmel-tdes.c: In function 'atmel_tdes_setkey':
drivers/crypto/atmel-tdes.c:803:14: warning: variable 'alg_name' set but not used [-Wunused-but-set-variable]

It is not used any more since
commit 52ea3cd2 ("crypto: atmel - Forbid 2-key 3DES in FIPS mode")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/atmel-tdes.c

@@ -800,12 +800,9 @@ static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 			   unsigned int keylen)
 {
 	struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
-	const char *alg_name;
 	u32 flags;
 	int err;
 
-	alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm));
-
 	flags = crypto_ablkcipher_get_flags(tfm);
 	err = __des3_verify_key(&flags, key);
 	if (unlikely(err)) {