net: ti: icssg-prueth: Fix signedness bug in prueth_init_rx_chns()

net: ti: icssg-prueth: Fix signedness bug in prueth_init_rx_chns()

The rx_chn->irq[] array is unsigned int but it should be signed for the
error handling to work.  Also if k3_udma_glue_rx_get_irq() returns zero
then we should return -ENXIO instead of success.

Fixes: 128d5874c082 ("net: ti: icssg-prueth: Add ICSSG ethernet driver")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Roger Quadros <[email protected]>
Reviewed-by: MD Danish Anwar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>