[PATCH] of: unittest: fix an error code in of_unittest_apply_overlay()

[Dan Carpenter]

We accidentally return zero on failure instead of a negative error code.

Fixes: 39a751a4cb7e ("of: change overlay apply input data from unflattened to 
FDT")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index dede77a79820..bc03902693b7 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -1417,15 +1417,13 @@ static int __init of_unittest_apply_overlay(int 
overlay_nr, int unittest_nr,
                int *overlay_id)
 {
        const char *overlay_name;
-       int ret;
 
        overlay_name = overlay_name_from_nr(overlay_nr);
 
-       ret = overlay_data_apply(overlay_name, overlay_id);
-       if (!ret) {
+       if (!overlay_data_apply(overlay_name, overlay_id)) {
                unittest(0, "could not apply overlay \"%s\"\n",
                                overlay_name);
-               return ret;
+               return -EFAULT;
        }
        of_unittest_track_overlay(*overlay_id);