net: mana: Return error code from mana_create_rxq()

net: mana: Return error code from mana_create_rxq()

mana_create_rxq() returns a struct mana_rxq pointer and returns NULL on
any failure. The caller, mana_add_rx_queues(), cannot tell what went
wrong and hardcodes the error as -ENOMEM. As a result the actual failure
reported by the lower layers (for example -EPROTO from a failed HW
request) is masked and every RX queue creation failure looks like an
out-of-memory error.

Return an ERR_PTR() encoded error code from mana_create_rxq() on failure
instead of NULL. The caller now propagates the returned error code
directly instead of substituting -ENOMEM.

Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)")
Signed-off-by: Aditya Garg <gargaditya@linux.microsoft.com>
Reviewed-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260727113759.2881500-1-gargaditya@linux.microsoft.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>