Emit a proper error message instead of dumping core when 1) GEOM_PART does not exist in the kernel, and 2) the GEOM in question does not exist. Additionally abort in case of programming errors that result in neither the class nor geom not being present in the gctl request.
Emit a proper error message instead of dumping core when 1)
GEOM_PART does not exist in the kernel, and 2) the GEOM in
question does not exist.
Additionally abort in case of programming errors that result
in neither the class nor geom not being present in the gctl
request.

Submitted by:	"Andrey V. Elsukov" <bu7cher@yandex.ru>
Approved by:	re (kib)

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