[PATCH net] ptp: ocp: Fix a couple NULL vs IS_ERR() checks

[Dan Carpenter <dan.carpenter@oracle.com>]

The ptp_ocp_get_mem() function does not return NULL, it returns error
pointers.

Fixes: 773bda964921 ("ptp: ocp: Expose various resources on the timecard.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/ptp/ptp_ocp.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index 34f943c8c9fd..0f1b5a7d2a89 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -1304,10 +1304,11 @@ ptp_ocp_register_ext(struct ptp_ocp *bp, struct ocp_resource *r)
 	if (!ext)
 		return -ENOMEM;
 
-	err = -EINVAL;
 	ext->mem = ptp_ocp_get_mem(bp, r);
-	if (!ext->mem)
+	if (IS_ERR(ext->mem)) {
+		err = PTR_ERR(ext->mem);
 		goto out;
+	}
 
 	ext->bp = bp;
 	ext->info = r->extra;
@@ -1371,8 +1372,8 @@ ptp_ocp_register_mem(struct ptp_ocp *bp, struct ocp_resource *r)
 	void __iomem *mem;
 
 	mem = ptp_ocp_get_mem(bp, r);
-	if (!mem)
-		return -EINVAL;
+	if (IS_ERR(mem))
+		return PTR_ERR(mem);
 
 	bp_assign_entry(bp, r, mem);
 
-- 
2.20.1