If not cylinder with type DILUENT or OXYGEN is defined, this function
returns -1 which should not be used as an index to an array. This
patch adds code to check for this return value and exit gracefully.
On line I marked with a comment. Someone more knowledgeable of that part of
code than me should double check that return is here what we want.
[Dirk Hohndel: fixed small oversight...]
Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
13934b0f02