OpenZFS 6550 - cmd/zfs: 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.

Authored by: Igor Kozhukhov <[email protected]>
Reviewed by: Matthew Ahrens <[email protected]>
Reviewed by: Andy Stormont <[email protected]>
Approved by: Dan McDonald <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Ported-by: Brian Behlendorf <[email protected]>

OpenZFS-issue: https://www.illumos.org/issues/6550
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/c16bcc4
Closes #5591 

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