removed unused variable "ret" in new function "mapi_query_prep". (icc did complain about it.)
removed unused variable "ret" in new function "mapi_query_prep".
(icc did complain about it.)

in "mapi_query_array", "ret" also not used after the final assignment;
hence, compilers might use the skip the last statement:
"ret = answer_lookahead(hdl);"
!?

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb