drm/xe: Fix xe_device_probe() failure

drm/xe: Fix xe_device_probe() failure

Currently, xe_device_probe() jumps to err_unregister_display label in case
of failure except for its last call, which directly returns the error
without required cleanup handling. This results in stale drm device that
isn't cleaned up on unwind. Fix it.

[  810.194180] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:01.0/0000:03:00.0/drm/renderD128'
[  810.194183] CPU: 9 UID: 0 PID: 5616 Comm: modprobe Kdump: loaded Tainted: G S   U      E       7.2.0-rc2-xe #382 PREEMPT(full)
[  810.194185] Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER, [E]=UNSIGNED_MODULE
[  810.194186] Hardware name: ASUS System Product Name/PRIME Z790-P WIFI, BIOS 1805 10/30/2024
[  810.194186] Call Trace:
[  810.194187]  <TASK>
[  810.194188]  dump_stack_lvl+0xe0/0x100
[  810.194195]  dump_stack+0x14/0x20
[  810.194197]  sysfs_warn_dup+0x5f/0x80
[  810.194204]  sysfs_create_dir_ns+0xbe/0xd0
[  810.194210]  kobject_add_internal+0xbc/0x2b0
[  810.194215]  kobject_add+0x7c/0xe0
[  810.194220]  ? get_device_parent+0xcf/0x1e0
[  810.194227]  device_add+0xe3/0x870
[  810.194231]  ? __pfx_drm_gem_name_info+0x10/0x10 [drm]
[  810.194280]  drm_minor_register+0x73/0x130 [drm]
[  810.194322]  drm_dev_register+0x76/0x2a0 [drm]

Cc: stable@vger.kernel.org
Fixes: da3799c97572 ("drm/xe: Use GuC to do GGTT invalidations for the GuC firmware")
Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20260810123821.105605-1-raag.jadav@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
(cherry picked from commit 5ce3042c67c539480882567137ff8d56118885d6)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>