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block/vpc: fix uninitialised variable compiler warning 

Since commit cfc87e00 "block/vpc.c: Handle write failures in
get_image_offset()" older versions of gcc (in this case 4.7) incorrectly
warn that "ret" can be used uninitialised in vpc_co_pwritev().

Setting ret to 0 at the start of vpc_co_pwritev() prevents the warning
in gcc 4.7 and enables compilation with -Werror to succeed.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1500625265-23844-1-git-send-email-mark.cave-ayland@ilande.co.uk
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Mark Cave-Ayland 2017-07-21 09:21:05 +01:00 committed by Peter Maydell
parent ff9b547502
commit c8115f8eb8
1 changed files with 1 additions and 1 deletions
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block/vpc.c
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@ -649,7 +649,7 @@ vpc_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
int64_t image_offset;
int64_t n_bytes;
int64_t bytes_done = 0;
int ret;
int ret = 0;
VHDFooter *footer = (VHDFooter *) s->footer_buf;
QEMUIOVector local_qiov;