explicit check for NULL

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>

diff --git a/crypto/asn1/a_sign.c b/crypto/asn1/a_sign.c
index 6e6f497880143078e529f17a604045229f4c9012..dbf2812d6fcbee3c912c4edee9b224ca231629c7 100644 (file)
--- a/crypto/asn1/a_sign.c
+++ b/crypto/asn1/a_sign.c
@@ -243,12 +243,12 @@ int ASN1_item_sign_ctx(const ASN1_ITEM *it,
     type = EVP_MD_CTX_md(ctx);
     pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
 
-    if (!type || !pkey) {
+    if (NULL == type || NULL == pkey) {
         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
         goto err;
     }
 
-    if (!pkey->ameth) {
+    if (NULL == pkey->ameth) {
         ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
         goto err;
     }