OpenZFS 6551 - cmd/zpool: cleanup gcc warnings

Porting Notes:
- Many of the fixes proposed by this patch were already applied.
In the cases where a different but equivalent fix was made the
code was updated with the OpenZFS version to minimize differences.
- The zpool_get_vdev_by_name() function was previously removed
by commit  235db0a.

Authored by: Igor Kozhukhov <[email protected]>
Reviewed by: Matthew Ahrens <[email protected]>
Reviewed by: Andy Stormont <[email protected]>
Approved by: Robert Mustacchi <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Haakan T Johansson <[email protected]>
Ported-by: Brian Behlendorf <[email protected]>

OpenZFS-issue: https://www.illumos.org/issues/6551
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/b327cd3
Closes #5590 

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