eventdev: fix error sign

eventdev: fix error sign

Fixes: c9bf83947e2e ("eventdev: add eth Tx adapter APIs")
Fixes: 47d05b292820 ("eventdev: add timer adapter common code")
Fixes: 6750b21bd6af ("eventdev: add default software timer adapter")
Fixes: c75f7897ea35 ("eventdev: set error code in port link/unlink functions")
Fixes: 7d1acc9dde93 ("eventdev: introduce helper function for enqueue burst")
Fixes: 406aed4e0dd9 ("eventdev: add errno-style return values")
Fixes: cc7b73ea9e3b ("eventdev: add new software timer adapter")
Cc: stable@dpdk.org
Signed-off-by: Dilshod Urazov <dilshod.urazov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>