usb: musb: omap2430: clean up probe error handling

usb: musb: omap2430: clean up probe error handling

Using numbered error labels is discouraged (e.g. as it requires
renumbering them when adding a new intermediate error path).

Rename the error labels after what they do.

While at it, drop the redundant platform allocation failure dev_err()
as the error would already have been logged by the allocator.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20250724091910.21092-6-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>