[PATCH 2/7] block/blkio: fix error return value on getlength()

Negative values should be return for errors.

It also helps with GCC false-positives:
../block/blkio.c: In function ‘blkio_co_getlength’:
../block/blkio.c:943:8: error: ‘ret’ may be used uninitialized [-Werror=maybe-uninitialized]
  943 |     if (ret < 0) {
      |        ^

Fixes: fd66dbd424 ("blkio: add libblkio block driver")
Signed-off-by: Marc-André Lureau <[email protected]>
---
 block/blkio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blkio.c b/block/blkio.c
index fb8bec27d71a..d2ba2a4d58dc 100644
--- a/block/blkio.c
+++ b/block/blkio.c
@@ -935,13 +935,13 @@ static int64_t coroutine_fn blkio_co_getlength(BlockDriverState *bs)
 {
     BDRVBlkioState *s = bs->opaque;
     uint64_t capacity;
-    int ret;
+    int ret = -1;
 
     WITH_QEMU_LOCK_GUARD(&s->blkio_lock) {
         ret = blkio_get_uint64(s->blkio, "capacity", &capacity);
     }
     if (ret < 0) {
-        return -ret;
+        return ret;
     }
 
     return capacity;

-- 
2.55.0