crypto: user - fix empty string test in report API

The current test for empty strings fails because it is testing the
address of a field, not a pointer. So the test will always be true.
Test the first character in the string to not be null instead.

Signed-off-by: Mathias Krause <[email protected]>
Cc: Steffen Klassert <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

Author: minipli

crypto/crypto_user.c

@@ -196,7 +196,7 @@ static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
 	struct crypto_dump_info info;
 	int err;
 
-	if (!p->cru_driver_name)
+	if (!p->cru_driver_name[0])
 		return -EINVAL;
 
 	alg = crypto_alg_match(p, 1);