[PATCH] btrfs : fix memory leak in add_block_entry

[trix]

From: Tom Rix <t...@redhat.com>

clang static analysis flags this error

fs/btrfs/ref-verify.c:290:3: warning: Potential leak of memory pointed to by 
're' [unix.Malloc]
                kfree(be);
                ^~~~~
The problem is in this block of code

                if (root_objectid) {
                        struct root_entry *exist_re;

                        exist_re = insert_root_entry(&exist->roots, re);
                        if (exist_re)
                                kfree(re);
                }

There is no 'else' block freeing when root_objectid == 0

So add an 'else'

Fixes: fd708b81d972 ("Btrfs: add a extent ref verify tool")

Signed-off-by: Tom Rix <t...@redhat.com>
---
 fs/btrfs/ref-verify.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/btrfs/ref-verify.c b/fs/btrfs/ref-verify.c
index af92525dbb16..7f03dbe5b609 100644
--- a/fs/btrfs/ref-verify.c
+++ b/fs/btrfs/ref-verify.c
@@ -286,6 +286,8 @@ static struct block_entry *add_block_entry(struct 
btrfs_fs_info *fs_info,
                        exist_re = insert_root_entry(&exist->roots, re);
                        if (exist_re)
                                kfree(re);
+               } else {
+                       kfree(re);
                }
                kfree(be);
                return exist;
-- 
2.18.1