RDMA/core: Fix skipped usage for driver built FRMR key

When creating FRMR handles following a netlink command to pin handles,
use the key after driver callback instead of using the key passed directly
from user.

Fixes: 020d189d16 ("RDMA/core: Add pinned handles to FRMR pools")
Link: https://patch.msgid.link/r/20260610000145.820592-4-michaelgur@nvidia.com
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/core/frmr_pools.c

@@ -426,7 +426,7 @@ int ib_frmr_pools_set_pinned(struct ib_device *device, struct ib_frmr_key *key,
 	if (!handles)
 		return -ENOMEM;
 
-	ret = pools->pool_ops->create_frmrs(device, key, handles,
+	ret = pools->pool_ops->create_frmrs(device, &driver_key, handles,
 					    needed_handles);
 	if (ret) {
 		kfree(handles);