[PATCH] Fix some coding issues in zpool(8) uncovered by clang

[Garrett Cooper]

	Long story short, I was compiling rescue with clang this past week with -g and -O0, which unrooted a few issues with zpool (more than the standard optimization, BTW..). The following patch fixes some formatting string and assign/test issues in zpool(8), and shouldn't introduce any noticeable functional changes.
	If someone could review and possibly commit it, that would be great.
Thanks,
-Garrett

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