drm/sysfb: ofdrm: fix PCI device reference leaks

drm/sysfb: ofdrm: fix PCI device reference leaks

display_get_pci_dev_of() gets a referenced PCI device via
pci_get_device(). Drop that reference when pci_enable_device() fails and
release it during the managed teardown path after pci_disable_device().

Without that, ofdrm leaks the pci_dev reference on both the error path
and the normal cleanup path.

Fixes: c8a17756c425 ("drm/ofdrm: Add ofdrm for Open Firmware framebuffers")
Co-developed-by: Myeonghun Pak <mhun512@gmail.com>
Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
Co-developed-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Ijae Kim <ae878000@gmail.com>
Co-developed-by: Taegyu Kim <tmk5904@psu.edu>
Signed-off-by: Taegyu Kim <tmk5904@psu.edu>
Signed-off-by: Yuho Choi <dbgh9129@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260420002513.216-1-dbgh9129@gmail.com