[patch] tracing: checking for NULL instead of IS_ERR()

[Dan Carpenter]

tracing_map_elt_alloc() returns ERR_PTRs on error, never NULL.

Fixes: 08d43a5fa063 ('tracing: Add lock-free tracing_map')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c
index e0f1729..e7dfc5e 100644
--- a/kernel/trace/tracing_map.c
+++ b/kernel/trace/tracing_map.c
@@ -814,7 +814,7 @@ static struct tracing_map_elt *copy_elt(struct 
tracing_map_elt *elt)
        unsigned int i;
 
        dup_elt = tracing_map_elt_alloc(elt->map);
-       if (!dup_elt)
+       if (IS_ERR(dup_elt))
                return NULL;
 
        if (elt->map->ops && elt->map->ops->elt_copy)