usb: dwc3: gadget: combine return points into a single one

Upstream Linux commit c0ca324d09a0.

dwc3_send_gadget_ep_cmd() had three return
points. That becomes a pain to track when we need to
debug something or if we need to add more code
before returning.

Let's combine all three return points into a single
one just by introducing a local 'ret' variable.

Signed-off-by: Felipe Balbi <[email protected]>
Signed-off-by: Alexander Sverdlin <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mattijs Korpershoek <[email protected]>

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