[patch] sbp-target: checking for NULL instead of IS_ERR

[Dan Carpenter]

We changed this from kzalloc to sbp_mgt_get_req() so we need to change
from checking for NULL to check for error pointers.

Fixes: c064b2a78989 ('sbp-target: Conversion to percpu_ida tag pre-allocation')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/target/sbp/sbp_target.c b/drivers/target/sbp/sbp_target.c
index 251d532..a04b0605f 100644
--- a/drivers/target/sbp/sbp_target.c
+++ b/drivers/target/sbp/sbp_target.c
@@ -951,7 +951,7 @@ static void tgt_agent_fetch_work(struct work_struct *work)
 
        while (next_orb && tgt_agent_check_active(agent)) {
                req = sbp_mgt_get_req(sess, sess->card, next_orb);
-               if (!req) {
+               if (IS_ERR(req)) {
                        spin_lock_bh(&agent->lock);
                        agent->state = AGENT_STATE_DEAD;
                        spin_unlock_bh(&agent->lock);