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spa: v4l2: query_ext_ctrl_ioctl(): only check errno on failure

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`errno` is not guaranteed to be cleared, so only check it if
the previous call actually failed.
This commit is contained in:
Barnabás Pőcze 2024-12-03 20:43:59 +01:00 • committed by Wim Taymans
parent 0549996c87
commit de609ff994
1 changed files with 1 additions and 1 deletions
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2
spa/plugins/v4l2/v4l2-utils.c
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@ -1072,7 +1072,7 @@ static int query_ext_ctrl_ioctl(struct port *port, struct v4l2_query_ext_ctrl *q
if (port->have_query_ext_ctrl) {
res = xioctl(dev->fd, VIDIOC_QUERY_EXT_CTRL, qctrl);
if (errno != ENOTTY)
if (res == 0 || errno != ENOTTY)
return res;
port->have_query_ext_ctrl = false;
}