Coverity 1453628: Null pointer dereferences (REVERSE_INULL)

Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/9805)

crypto/evp/kdf_lib.c

@@ -59,7 +59,7 @@ EVP_KDF_CTX *EVP_KDF_CTX_dup(const EVP_KDF_CTX *src)
 {
     EVP_KDF_CTX *dst;
 
-    if (src->data == NULL || src == NULL || src->meth->dupctx == NULL)
+    if (src == NULL || src->data == NULL || src->meth->dupctx == NULL)
         return NULL;
 
     dst = OPENSSL_malloc(sizeof(*dst));