[media] exynos4-is: Remove debugfs entries properly

Ensure both debugfs: fimc_is directory and the fw_log file
are properly removed in the driver cleanup sequence.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/exynos4-is/fimc-is.c

@@ -766,7 +766,7 @@ static const struct file_operations fimc_is_debugfs_fops = {
 
 static void fimc_is_debugfs_remove(struct fimc_is *is)
 {
-	debugfs_remove(is->debugfs_entry);
+	debugfs_remove_recursive(is->debugfs_entry);
 	is->debugfs_entry = NULL;
 }