fbdev: sysfs files can't disappear before the device is gone

Which means lock_fb_info can never fail. Remove the error handling.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Rob Clark <robdclark@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528090304.9388-14-daniel.vetter@ffwll.ch

drivers/video/fbdev/core/fbsysfs.c

@@ -175,10 +175,7 @@ static ssize_t store_modes(struct device *device,
 		return -EINVAL;
 
 	console_lock();
-	if (!lock_fb_info(fb_info)) {
-		console_unlock();
-		return -ENODEV;
-	}
+	lock_fb_info(fb_info);
 
 	list_splice(&fb_info->modelist, &old_list);
 	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
@@ -405,10 +402,7 @@ static ssize_t store_fbstate(struct device *device,
 	state = simple_strtoul(buf, &last, 0);
 
 	console_lock();
-	if (!lock_fb_info(fb_info)) {
-		console_unlock();
-		return -ENODEV;
-	}
+	lock_fb_info(fb_info);
 
 	fb_set_suspend(fb_info, (int)state);