libcamera: v4l2_device: Remove unused set of ret

The last assignment of the ret variable in getControls() is not consumed
so it's unnecessary to set it. This likely originates from a similar
code flow in setControls() where the ret variable is later consumed.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/v4l2_device.cpp

@@ -243,7 +243,6 @@ ControlList V4L2Device::getControls(const std::vector<uint32_t> &ids)
 		LOG(V4L2, Error) << "Unable to read control " << errorIdx
 				 << ": " << strerror(-ret);
 		count = errorIdx - 1;
-		ret = errorIdx;
 	}
 
 	updateControls(&ctrls, v4l2Ctrls, count);