Fix cquoting crash with Decimal() type.
Fix cquoting crash with Decimal() type.

Seems there can be types which have buffer operations struct,
but no function pointers.  So check also for called functions.

ssinger/skytools-cvs,ssinger/skytools-cvs,ssinger/skytools-cvs,mpihlak/skytools-dev,mpihlak/skytools-dev,mpihlak/skytools-dev