[PULL 1/2] nbd: Silence Coverity false positive

[Eric Blake]

Coverity noticed (CID 1436125) that we check the return value of
nbd_extent_array_add in most places, but not at the end of
bitmap_to_extents().  The return value exists to break loops before a
future iteration, so there is nothing to check if we are already done
iterating.  Adding a cast to void, plus a comment why, pacifies
Coverity.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201111163510.713855-1-eblake@redhat.com>
[eblake: Prefer cast to void over odd && usage]
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 nbd/server.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/nbd/server.c b/nbd/server.c
index d145e1a69083..613ed2634ada 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -2129,8 +2129,8 @@ static void bitmap_to_extents(BdrvDirtyBitmap *bitmap,
     }

     if (!full) {
-        /* last non dirty extent */
-        nbd_extent_array_add(es, end - start, 0);
+        /* last non dirty extent, nothing to do if array is now full */
+        (void) nbd_extent_array_add(es, end - start, 0);
     }

     bdrv_dirty_bitmap_unlock(bitmap);
-- 
2.28.0