ice: Fix freeing uninitialized pointers

Automatically cleaned up pointers need to be initialized before exiting
their scope.  In this case, they need to be initialized to NULL before
any return statement.

Fixes: 90f821d7 ("ice: avoid unnecessary devm_ usage")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>