The source project of this merge request has been removed.
initialize instance pointer *minst = NULL for first call of gsapi_new_instance(...) -- otherwise roger crashes with segfault
from https://www.ghostscript.com/doc/psi/iapi.c /* Create a new instance of Ghostscript.
- First instance per process call with *pinstance == NULL
- next instance in a proces call with *pinstance == copy of valid_instance pointer
- *pinstance is set to a new instance pointer. */