From: Marc-André Lureau<marcandre.lureau@redhat.com>
../block/mirror.c:404:5: error: ‘ret’ may be used uninitialized
[-Werror=maybe-uninitialized]
../block/mirror.c:895:12: error: ‘ret’ may be used uninitialized
[-Werror=maybe-uninitialized]
../block/mirror.c:578:12: error: ‘ret’ may be used uninitialized
[-Werror=maybe-uninitialized]
Change a variable to int, as suggested by Manos: "bdrv_co_preadv()
which is int and is passed as an int argument to mirror_read_complete()"
Signed-off-by: Marc-André Lureau<marcandre.lureau@redhat.com>