more: exit if write to stdout errors out

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

util-linux/more.c

@@ -191,6 +191,9 @@ int more_main(int argc UNUSED_PARAM, char **argv)
 			}
 			/* My small mind cannot fathom backspaces and UTF-8 */
 			putchar(c);
+
+			if (ferror(stdout)) /* if tty was destroyed (closed xterm, etc) */
+				goto end;
 		}
 		fclose(file);
 		fflush_all();