crypto: lskcipher - Return EINVAL when ecb_name fails sanity checks

Set the error value to -EINVAL instead of zero when the underlying
name (within "ecb()") fails basic sanity checks.

Fixes: 8aee5d4e ("crypto: lskcipher - Add compatibility wrapper around ECB")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202310111323.ZjK7bzjw-lkp@intel.com/Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/lskcipher.c

@@ -583,6 +583,7 @@ struct lskcipher_instance *lskcipher_alloc_instance_simple(
 	if (ecb_name[0]) {
 		int len;
 
+		err = -EINVAL;
 		len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4],
 			      sizeof(ecb_name));
 		if (len < 2)