genirq/msi: Free the fwnode created by msi_create_device_irq_domain()

msi_create_device_irq_domain creates a fwnode for the new domain, but it
is never freed. kmemleak reports:

unreferenced object 0xffff888120ba9a00 (size 96):
  comm "systemd-modules", pid 221, jiffies 4294893411 (age 635.732s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 e0 19 8b 83 ff ff ff ff  ................
    00 00 00 00 00 00 00 00 18 9a ba 20 81 88 ff ff  ........... ....
  backtrace:
    [<00000000bcb7f3b1>] kmalloc_trace+0x27/0x110
    [<000000008cdbc98d>] __irq_domain_alloc_fwnode+0x51/0x2b0
    [<00000000c57acf9d>] msi_create_device_irq_domain+0x283/0x670
    [<000000009b567982>] __pci_enable_msix_range+0x49e/0xdb0
    [<0000000077cc1445>] pci_alloc_irq_vectors_affinity+0x11f/0x1c0
    [<00000000532e9ef5>] mlx5_irq_table_create+0x24c/0x940 [mlx5_core]
    [<00000000fabd2b80>] mlx5_load+0x1fa/0x680 [mlx5_core]
    [<000000006bb22ae4>] mlx5_init_one+0x485/0x670 [mlx5_core]
    [<00000000eaa5e1ad>] probe_one+0x4c2/0x720 [mlx5_core]
    [<00000000df8efb43>] local_pci_probe+0xd6/0x170
    [<0000000085cb9924>] pci_device_probe+0x231/0x6e0
    [<000000002671d86e>] really_probe+0x1cf/0xaa0
    [<000000002aeba218>] __driver_probe_device+0x18f/0x470
    [<000000002aec9527>] driver_probe_device+0x49/0x120
    [<000000005f45a989>] __driver_attach+0x1ff/0x4a0
    [<0000000000dcaab2>] bus_for_each_dev+0x11e/0x1a0

Use the proper free operation for the fwnode so the name is freed during
error unwind of msi_create_device_irq_domain() and free the fwnode in
msi_remove_device_irq_domain() if it was automatically allocated.

issue: 3316698
Change-Id: I538a00d459c9479a3f322400cee7426d2a5db1d3
Fixes: 27a6dea3 ("genirq/msi: Provide msi_create/free_device_irq_domain()")
Reported-by: Omri Barazi <obarazi@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
(cherry picked from commit c02714e4c536679a7a989fbfd9c79d583a3eedbb)