drm/fb_cma_helper: remove duplicate const from drm_fb_cma_alloc

Duplicated const, only one is required.  Also reformat line to ensure
it is less than 80 columns wide.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1453287574-3645-1-git-send-email-colin.king@canonical.comSigned-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_fb_cma_helper.c

@@ -74,7 +74,8 @@ static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
 };
 
 static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
-	const const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_cma_object **obj,
+	const struct drm_mode_fb_cmd2 *mode_cmd,
+	struct drm_gem_cma_object **obj,
 	unsigned int num_planes)
 {
 	struct drm_fb_cma *fb_cma;