usb: dwc3: gadget: always cleanup all TRBs

[ Upstream commit 7c705dfe2ebe731c8fd068623b6b4df2d3512c08 ]

If we stop earlier due to short packet, we will
not be able to giveback all TRBs.

Cc: <stable@vger.kernel.org>
Cc: Brian E Rogers <brian.e.rogers@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>