seq_file: return a negative error code when seq_path_root() fails.

seq_path_root() is returning a return value of successful __d_path()
instead of returning a negative value when mangle_path() failed.

This is not a bug so far because nobody is using return value of
seq_path_root().

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/seq_file.c b/fs/seq_file.c
index 6c959275f2d0..66efd0aa8fb3 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -470,6 +470,7 @@ int seq_path_root(struct seq_file *m, struct path *path, struct path *root,
                                 m->count = s - m->buf;
                                 return 0;
                         }
+                        err = -ENAMETOOLONG;
                 }
         }
         m->count = m->size;