Re: [Qemu-devel] [Qemu-trivial] [PATCH] block: Remove unused assignment (fixes warning from clang)

[Michael Tokarev]

28.09.2013 13:55, Stefan Weil wrote:

blockdev.c:1929:13: warning: Value stored to 'ret' is never read
             ret = 0;
             ^     ~

Applied to the trivial patches queue.

Signed-off-by: Stefan Weil <s...@weilnetz.de>
---
  blockdev.c |    1 -
  1 file changed, 1 deletion(-)

diff --git a/blockdev.c b/blockdev.c
index 8aa66a9..8c83f6f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1926,7 +1926,6 @@ void qmp_drive_mirror(const char *device, const char 
*target,
      } else {
          switch (mode) {
          case NEW_IMAGE_MODE_EXISTING:
-            ret = 0;
              break;

While this one is obviously unused assignment,
there's on more usage of `ret' variable in this
function, -- it is to store the return value
from bdrv_open():

    ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
                    &local_err);
    if (ret < 0) {...

What's the rule about converting that into if() ?

Thanks,

/mjt