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Re: [Qemu-trivial] [PATCH] block: Remove unused assignment (fixes warnin

From: Michael Tokarev
Subject: Re: [Qemu-trivial] [PATCH] block: Remove unused assignment (fixes warning from clang)
Date: Sun, 29 Sep 2013 23:44:37 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130922 Icedove/17.0.9

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 <address@hidden>
  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 
      } else {
          switch (mode) {
-            ret = 0;

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,
    if (ret < 0) {...

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



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