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This patch removes the remaining exit calls from
 - sp_openserport
 - sp_opensocket
 - sp_docommand
 - internal_init

Almost all of this was done by Niklas.

Corresponding to flashrom svn r1557.
Signed-off-by: Niklas Söderlund <niso@kth.se>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>