[PATCH] Fix check for return value of create_pid_namespace

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The function in question returns ERR_PTR-s to indicate the
error, while the caller checks for return value to be NULL.

Found during testing the OpenVZ kernel with pid namespaces.

Signed-off-by: Pavel Emelyanov <[email protected]>
Signed-off-by: Alexey Dobriyan <[email protected]>
Cc: Sukadev Bhattiprolu <[email protected]>
Cc: Oleg Nesterov <[email protected]>

---
kernel/pid.c |    2 +-
1 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index faad017..cb1f3cb 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -543,7 +543,7 @@ struct pid_namespace *copy_pid_ns(unsign
		goto out_put;

	new_ns = create_pid_namespace(old_ns->level + 1);
-	if (new_ns != NULL)
+	if (!IS_ERR(new_ns))
		new_ns->parent = get_pid_ns(old_ns);

out_put:
-
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