net/mlx5: HWS, changed E2BIG error to a negative return code

Fixed all the 'E2BIG' returns in error flow of functions to
the negative '-E2BIG' as we are using negative error codes
everywhere in HWS code.

This also fixes the following smatch warnings:
	"warn: was negative '-E2BIG' intended?"

Fixes: 74a778b4 ("net/mlx5: HWS, added definers handling")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/f8c77688-7d83-4937-baba-ac844dfe2e0b@stanley.mountain/


Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>