usb: gadget: f_tcm: Decrement command ref count on cleanup

We submitted the command with TARGET_SCF_ACK_KREF, which requires
acknowledgment of command completion. If the command fails, make sure to
decrement the ref count.

Fixes: cff834c1 ("usb-gadget/tcm: Convert to TARGET_SCF_ACK_KREF I/O krefs")
Cc: stable@vger.kernel.org
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/3c667b4d9c8b0b580346a69ff53616b6a74cfea2.1733876548.git.Thinh.Nguyen@synopsys.com


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