RDMA/efa: Be consistent with success flow return value

The EFA driver is written with success oriented flows in mind, meaning
that functions should mostly end with a return 0 statement.
Error flows return their error value on their own instead of assuming
that the function will return the error at the end.

This commit fixes a bunch of functions that were not aligned with this
behavior.

Reviewed-by: Firas JahJah <[email protected]>
Reviewed-by: Yossi Leybovich <[email protected]>
Signed-off-by: Gal Pressman <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>

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