usb: gadget: uvc: remove pause flag use

The pause flag doesn't appear to serve a purpose as it is possible for
the pump worker thread to not be running when new buffers are queued.
Before the following change was introduced: "43cd0023 usb: gadget:
uvc_video: add worker to handle the frame pumping", the pause flag
status was discarded and never returned. This masked a current issues of
the userspace receiving non-zero values (considered unsuccessful) and
prevents trace_v4l2_qbuf() from being called.

Signed-off-by: Dan Vacura <w36195@motorola.com>
Link: https://lore.kernel.org/r/20220413192402.26063-1-w36195@motorola.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>