debugfs_create_dir() does not return NULL,but it is
possible to return error pointer. Most incorrect error checks
were fixed,but the one in mvebu_mbus_debugfs_init() was forgotten.

Fix the remaining error check.

Signed-off-by: Wang Ming <machel@vivo.com>
---
 drivers/bus/mvebu-mbus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 00cb792bda18..4c514894cc1f 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -993,7 +993,7 @@ static __init int mvebu_mbus_debugfs_init(void)
 		return 0;
 
 	s->debugfs_root = debugfs_create_dir("mvebu-mbus", NULL);
-	if (s->debugfs_root) {
+	if (!IS_ERR(s->debugfs_root)) {
 		s->debugfs_sdram = debugfs_create_file("sdram", S_IRUGO,
 						       s->debugfs_root, NULL,
 						       &mvebu_sdram_debug_fops);
-- 
2.25.1