response_get_{string,u64} include error handling for argument resp being
NULL but response_get_token does not handle this.

Make all three of response_get_{string,u64,token} handle NULL resp in
the same way.

Co-authored-by: Jonas Rabenstein <jonas.rabenst...@studium.uni-erlangen.de>
Signed-off-by: David Kozub <z...@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenst...@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sba...@plzdonthack.me>
Reviewed-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Jon Derrick <jonathan.derr...@intel.com>
---
 block/sed-opal.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 0348fb896a5d..3f368b14efd9 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -696,6 +696,11 @@ static const struct opal_resp_tok *response_get_token(
 {
        const struct opal_resp_tok *tok;
 
+       if (!resp) {
+               pr_debug("Response is NULL\n");
+               return ERR_PTR(-EINVAL);
+       }
+
        if (n >= resp->num) {
                pr_debug("Token number doesn't exist: %d, resp: %d\n",
                         n, resp->num);
-- 
2.20.1

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