[PATCH] fs : initialize return for iter_file_splice_write

[trix]

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

clang static analysis flags this garbarge return
fs/splice.c:786:2: warning: Undefined or garbage value returned to caller 
[core.uninitialized.UndefReturn]
        return ret;
        ^~~~~~~~~~

ssize_t
iter_file_splice_write( ... size_t len, ..
        sd.total_len = len

        ssize_t ret;

        while (sd.total_len) {
              ...
              ret =
        }

If the input len is 0, the while loop will never run and ret will
not be set.

So handle similar to splice_direct_to_actor and initialize ret to 0

Signed-off-by: Tom Rix <t...@redhat.com>
---
 fs/splice.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/splice.c b/fs/splice.c
index d7c8a7c4db07..f65e072bcc2c 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -691,7 +691,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct 
file *out,
        int nbufs = pipe->max_usage;
        struct bio_vec *array = kcalloc(nbufs, sizeof(struct bio_vec),
                                        GFP_KERNEL);
-       ssize_t ret;
+       ssize_t ret = 0;
 
        if (unlikely(!array))
                return -ENOMEM;
-- 
2.18.1