RDMA/core: Fix GID entry ref leak when create_ah fails

If AH create request fails, release sgid_attr to avoid GID entry
referrence leak reported while releasing GID table

Fixes: 1a1f460 ("RDMA: Hold the sgid_attr inside the struct ib_ah/qp")
Link: https://lore.kernel.org/r/20230401063424.342204-1-saravanan.vajravel@broadcom.com
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Saravanan Vajravel <saravanan.vajravel@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/core/verbs.c

@@ -532,6 +532,8 @@ static struct ib_ah *_rdma_create_ah(struct ib_pd *pd,
 	else
 		ret = device->ops.create_ah(ah, &init_attr, NULL);
 	if (ret) {
+		if (ah->sgid_attr)
+			rdma_put_gid_attr(ah->sgid_attr);
 		kfree(ah);
 		return ERR_PTR(ret);
 	}