[PATCH] nbd: fix ifnullfree.cocci warnings

drivers/block/nbd.c:937:2-26: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values. drivers/block/nbd.c:918:2-26: WARNING: NULL check before freeing

[PATCH] nbd: fix ifnullfree.cocci warnings

drivers/block/nbd.c:937:2-26: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values. drivers/block/nbd.c:918:2-26: WARNING: NULL check before freeing