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Fix several issues pointed out by Coverity (reported by Tome Lane). - In row_is_in_frame(), return value of window_gettupleslot() was not checked. - WinGetFuncArgInPartition() tried to derefference "isout" pointer even if it could be NULL in some places. Besides the issues, I also fixed a compiler warning reported by Álvaro Herrera. Moreover, in WinGetFuncArgInPartition refactor the do...while loop so that the codes inside the loop simpler. Also simplify the case when abs_pos < 0. Author: Tatsuo Ishii <ishii@postgresql.org> Reviewed-by: Paul Ramsey <pramsey@cleverelephant.ca> Reported-by: Tom Lane <tgl@sss.pgh.pa.us> Reported-by: Álvaro Herrera <alvherre@kurilemu.de> Discussion: https://postgr.es/m/1686755.1759679957%40sss.pgh.pa.us Discussion: https://postgr.es/m/202510051612.gw67jlc2iqpw%40alvherre.pgsql