Use rb_entry_safe() instead of container_of() to simplify the code.

Signed-off-by: Geliang Tang <geliangt...@gmail.com>
---
 drivers/staging/lustre/lustre/osc/osc_cache.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c 
b/drivers/staging/lustre/lustre/osc/osc_cache.c
index b0f030c..6048df9 100644
--- a/drivers/staging/lustre/lustre/osc/osc_cache.c
+++ b/drivers/staging/lustre/lustre/osc/osc_cache.c
@@ -142,10 +142,7 @@ static const char *oes_strings[] = {
 
 static inline struct osc_extent *rb_extent(struct rb_node *n)
 {
-       if (!n)
-               return NULL;
-
-       return container_of(n, struct osc_extent, oe_node);
+       return rb_entry_safe(n, struct osc_extent, oe_node);
 }
 
 static inline struct osc_extent *next_extent(struct osc_extent *ext)
-- 
2.9.3

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