DebCheck QA: fflush() called on input stream "stdin" may result in undefined behaviour

[hamish]

(see #1311)

• ./lib/edit/edit_cellhd.c:558 [error] - fflush() called on input stream "stdin" may result in undefined behaviour
• ./lib/vask/V_exit.c:57 [error] - fflush() called on input stream "stdin" may result in undefined behaviour

thanks, Hamish

[hamish]

 fflush(stdin);

->

 #include <stdio.h>
 scanf("%*[^\n]%*c");

?, Hamish