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

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: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)")
Signed-off-by: Xiongfeng Wang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c

···
 
 	if (!found)
 		return false;
+	pci_dev_put(pdev);
 
 	adev->bios = kmalloc(size, GFP_KERNEL);
 	if (!adev->bios) {