drm: fix building on non-PCI platforms

[Arnd Bergmann]

BenH's fix to correct building on multi-domain systems broke
building DRM for platforms without PCI support. This makes
the call to pci_domain_nr conditional in order to fix compilation.

Signed-off-by: Arnd Bergmann <arnd at arndb.de>

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 7809d23..5ff5819 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1099,7 +1099,11 @@ static inline int drm_get_pci_domain(struct drm_device *dev)
 		return 0;
 #endif /* __alpha__ */
 
+#ifdef CONFIG_PCI
 	return pci_domain_nr(dev->pdev->bus);
+#else
+	return 0;
+#endif
 }
 
 #if __OS_HAS_AGP