[PATCH] dm-pcache: fix uninitialized variable issue

[Dongsheng Yang <dongsheng.yang@linux.dev>]

The 'ret' varialbe may be returned without initialized in some branch,
this patch make sure it is initialized correctly with 0.

Fixes: 6fb8fbbaf147 ("dm-pcache: add persistent cache target in device-mapper")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202508151712.qMqD87iI-lkp@intel.com/
Signed-off-by: Dongsheng Yang <dongsheng.yang@linux.dev>
---
 drivers/md/dm-pcache/cache_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-pcache/cache_dev.c b/drivers/md/dm-pcache/cache_dev.c
index 722d7e952262..a7dafe8d35f7 100644
--- a/drivers/md/dm-pcache/cache_dev.c
+++ b/drivers/md/dm-pcache/cache_dev.c
@@ -21,7 +21,7 @@ static int build_vmap(struct dax_device *dax_dev, long total_pages, void **vaddr
 	struct page **pages;
 	long i = 0, chunk;
 	unsigned long pfn;
-	int ret;
+	int ret = 0;
 
 	pages = vmalloc_array(total_pages, sizeof(struct page *));
 	if (!pages)
-- 
2.43.0