usb: dwc3: gadget: Fix TRB reclaim logic for short transfers and ZLPs

usb: dwc3: gadget: Fix TRB reclaim logic for short transfers and ZLPs

Commit 96c7bf8f6b3e ("usb: dwc3: gadget: Cleanup SG handling") updated
the TRB reclaim path to use the TRB CHN (Chain) bit to determine whether
a TRB was part of a chain. However, this inadvertently changed the
behavior of reclaiming the final TRB in some scatter-gather or short
transfer cases.

In particular, if the final TRB did not have the CHN bit set, the
cleanup path could incorrectly skip clearing the HWO (Hardware Own)
bit, leaving stale TRBs in the ring. This resulted in broken data
transfer completions in userspace, notably for MTP over FunctionFS.

Fix this by unconditionally clearing the HWO bit during TRB reclaim,
regardless of the CHN bit state. This restores correct behavior
especially for transfers that require ZLPs or end on non-CHN TRBs.

Fixes: 61440628a4ff ("usb: dwc3: gadget: Cleanup SG handling")
Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/AM8PR06MB7521A29A8863C838B54987B6BC7BA@AM8PR06MB7521.eurprd06.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>