ibmvnic: Free rwi on reset success

ibmvnic: Free rwi on reset success

Free the rwi structure in the event that the last rwi in the list
processed successfully. The logic in commit f8de8f17f706 ("ibmvnic:
retry reset if there are no other resets") introduces an issue that
results in a 32 byte memory leak whenever the last rwi in the list
gets processed.

Fixes: f8de8f17f706 ("ibmvnic: retry reset if there are no other resets")
Signed-off-by: Nick Child <nnac123@linux.ibm.com>
Link: https://lore.kernel.org/r/20221031150642.13356-1-nnac123@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>