drm/nouveau: free memory allocated with alloc_apertures()

Fix a memory leak by deallocating the memory we got from
alloc_apertures().
Signed-off-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -223,6 +223,7 @@ nouveau_drm_probe(struct pci_dev *pdev, const struct pci_device_id *pent)
 	boot = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
 #endif
 	remove_conflicting_framebuffers(aper, "nouveaufb", boot);
+	kfree(aper);
 
 	ret = nouveau_device_create(pdev, nouveau_name(pdev), pci_name(pdev),
 				    nouveau_config, nouveau_debug, &device);