a68: fix lowering of maxabschar [PR algol68/126330] Signed-off-by: Jose E. Marchesi <jemarch@gnu.org> gcc/algol68/ChangeLog PR algol68/126330 * a68-low-chars.cc (a68_char_max): abscharmax is an int, not a char. gcc/testsuite/ChangeLog * algol68/execute/max-abs-char-1.a68: New test. (cherry picked from commit a69f9f381f229ae33cb18803d0fa916801b23570)