netdevsim: fix memory leak in nsim_bus_dev_new()

netdevsim: fix memory leak in nsim_bus_dev_new()

If device_register() failed in nsim_bus_dev_new(), the value of reference
in nsim_bus_dev->dev is 1. obj->name in nsim_bus_dev->dev will not be
released.

unreferenced object 0xffff88810352c480 (size 16):
  comm "echo", pid 5691, jiffies 4294945921 (age 133.270s)
  hex dump (first 16 bytes):
    6e 65 74 64 65 76 73 69 6d 31 00 00 00 00 00 00  netdevsim1......
  backtrace:
    [<000000005e2e5e26>] __kmalloc_node_track_caller+0x3a/0xb0
    [<0000000094ca4fc8>] kvasprintf+0xc3/0x160
    [<00000000aad09bcc>] kvasprintf_const+0x55/0x180
    [<000000009bac868d>] kobject_set_name_vargs+0x56/0x150
    [<000000007c1a5d70>] dev_set_name+0xbb/0xf0
    [<00000000ad0d126b>] device_add+0x1f8/0x1cb0
    [<00000000c222ae24>] new_device_store+0x3b6/0x5e0
    [<0000000043593421>] bus_attr_store+0x72/0xa0
    [<00000000cbb1833a>] sysfs_kf_write+0x106/0x160
    [<00000000d0dedb8a>] kernfs_fop_write_iter+0x3a8/0x5a0
    [<00000000770b66e2>] vfs_write+0x8f0/0xc80
    [<0000000078bb39be>] ksys_write+0x106/0x210
    [<00000000005e55a4>] do_syscall_64+0x35/0x80
    [<00000000eaa40bbc>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

Fixes: 40e4fe4ce115 ("netdevsim: move device registration and related code to bus.c")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Link: https://lore.kernel.org/r/20221026015405.128795-1-shaozhengchao@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>