[PATCH v3] ptp: fix an IS_ERR() vs NULL check

[Dan Carpenter]

We recently modified pps_register_source() to return error pointers
instead of NULL but it seems like there was a merge issue and part of
the commit was lost.  Anyway, the ptp_clock_register() function needs to
be updated to check for IS_ERR() as well.

Fixes: 3b1ad360acad ("pps: using ERR_PTR instead of NULL while 
pps_register_source fails")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
v2:  Use the correct Fixes tag.
v3:  Add Greg to the CC list for real this time.

 drivers/ptp/ptp_clock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index 8a81eecc0ecd..48f3594a7458 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -265,8 +265,8 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info 
*info,
                pps.mode = PTP_PPS_MODE;
                pps.owner = info->owner;
                ptp->pps_source = pps_register_source(&pps, PTP_PPS_DEFAULTS);
-               if (!ptp->pps_source) {
-                       err = -EINVAL;
+               if (IS_ERR(ptp->pps_source)) {
+                       err = PTR_ERR(ptp->pps_source);
                        pr_err("failed to register pps source\n");
                        goto no_pps;
                }
-- 
2.11.0