drm: small cleanups

This patch contains the following small cleanups:
- make two needlessly global functions static
- drm_sysfs.c: every file should #include the header with the prototypes
              of the global functions it is offering

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c
index 8eff073..f28e70a 100644
--- a/drivers/char/drm/drm_bufs.c
+++ b/drivers/char/drm/drm_bufs.c
@@ -1041,7 +1041,7 @@
 	return 0;
 }
 
-int drm_addbufs_fb(drm_device_t *dev, drm_buf_desc_t *request)
+static int drm_addbufs_fb(drm_device_t *dev, drm_buf_desc_t *request)
 {
 	drm_device_dma_t *dma = dev->dma;
 	drm_buf_entry_t *entry;