[PATCH] rbtree: stop iteration early in rb_find_first

[Li RongQing]

stop iteration if match is not NULL and result of cmp is
not zero, this means the matched node has been found, and
the node with same key has been passed

Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx>
---
 include/linux/rbtree.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index d31ecaf4fdd3..2689771df9bb 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -324,6 +324,9 @@ rb_find_first(const void *key, const struct rb_root *tree,
 		} else if (c > 0) {
 			node = node->rb_right;
 		}
+
+		if (match && c)
+			break;
 	}
 
 	return match;
-- 
2.33.0.69.gc420321.dirty