Unchecked error codepaths in `Update_until`

[aaraney]

Update_until calls Update in a loop and later if a partial timestep update is requested. In both cases, Update could return BMI_FAILURE but that error path is not handled.

cfe/src/bmi_cfe.c

Line 1604 in a349a95

Update (self);

cfe/src/bmi_cfe.c

Line 1614 in a349a95

Update (self);