drm/amdgpu: Fix PCI device refcount leak in amdgpu_atrm_get_bios()

drm/amdgpu: Fix PCI device refcount leak in amdgpu_atrm_get_bios()

[ Upstream commit d9107cae9740ce3d5f0a521573020b3a0522ff6a ]

As comment of pci_get_class() says, it returns a pci_device with its
refcount increased and decreased the refcount for the input parameter
@from if it is not NULL.

If we break the loop in amdgpu_atrm_get_bios() with 'pdev' not NULL, we
need to call pci_dev_put() to decrease the refcount. Add the missing
pci_dev_put() to avoid refcount leak.

Fixes: 7acade7b3a33 ("drm/amdgpu: add core driver (v4)")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>