phyp: Make generic domain listing functions return -1 in case of error
phyp: Make generic domain listing functions return -1 in case of error

phypNumDomainsGeneric() and phypListDomainsGeneric() return 0 in case
of an error. This makes it impossible to distinguish between an actual
error and no domains being defined on the hypervisor. It also turn the
no domains situation into an error. Return -1 in case of an error to
fix this problem.

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