I think there is something wrong with the sample "cg_ssor_precon_c.c" in the for loop that applies the SSOR iteration. The purpose of the loop is to apply SSOR repeatedly on the array &tmp[3*n]. but inside the loop every time it starts using tmp[2*n] and overwrites the previous value in tmp[3*n]. So effectively the loop is equivalent to a single SSOR run regardless of the number of iterations desired.
Can somebody help me confirm this?