[PATCH] dm-pcache: use int type to store negative error codes

[Qianfeng Rong]

Change the 'ret' variable from u32 to int to store negative error codes or
zero returned by cache_kset_close().

Storing the negative error codes in unsigned type, doesn't cause an issue
at runtime but it's ugly. Additionally, assigning negative error codes to
unsigned type may trigger a GCC warning when the -Wsign-conversion flag
is enabled.

No effect on runtime.

Signed-off-by: Qianfeng Rong <rongqianf...@vivo.com>
---
 drivers/md/dm-pcache/cache_req.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-pcache/cache_req.c b/drivers/md/dm-pcache/cache_req.c
index bd5cace7de71..27f94c1fa968 100644
--- a/drivers/md/dm-pcache/cache_req.c
+++ b/drivers/md/dm-pcache/cache_req.c
@@ -805,7 +805,8 @@ static int cache_write(struct pcache_cache *cache, struct 
pcache_request *pcache
 int cache_flush(struct pcache_cache *cache)
 {
        struct pcache_cache_kset *kset;
-       u32 i, ret;
+       int ret;
+       u32 i;
 
        for (i = 0; i < cache->n_ksets; i++) {
                kset = get_kset(cache, i);
-- 
2.34.1