IB/core: Remove redundant pointer mm

The pointer mm is assigned a value but it is never used. The pointer is
redundant and can be removed.

Link: https://lore.kernel.org/r/20211204234904.105026-1-colin.i.king@gmail.comSigned-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/core/umem_odp.c

@@ -227,7 +227,6 @@ struct ib_umem_odp *ib_umem_odp_get(struct ib_device *device,
 				    const struct mmu_interval_notifier_ops *ops)
 {
 	struct ib_umem_odp *umem_odp;
-	struct mm_struct *mm;
 	int ret;
 
 	if (WARN_ON_ONCE(!(access & IB_ACCESS_ON_DEMAND)))
@@ -241,7 +240,7 @@ struct ib_umem_odp *ib_umem_odp_get(struct ib_device *device,
 	umem_odp->umem.length = size;
 	umem_odp->umem.address = addr;
 	umem_odp->umem.writable = ib_access_writable(access);
-	umem_odp->umem.owning_mm = mm = current->mm;
+	umem_odp->umem.owning_mm = current->mm;
 	umem_odp->notifier.ops = ops;
 
 	umem_odp->page_shift = PAGE_SHIFT;