ACPICA: acpiexec: Do not put STDIN into raw mode unless it is a terminal.

Eliminate an error message for batch-mode processing on unix
systems. ACPICA BZ 1114.

This patch is mainly for fixing the issues of acpiexec which is not in the
Linux upstream.

Link: https://bugs.acpica.org/show_bug.cgi?id=1114
Signed-off-by: Bob Moore <[e-mail]>
Signed-off-by: Lv Zheng <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

tools/power/acpi/os_specific/service_layers/osunixxf.c

···
 {
 	struct termios local_term_attributes;
 
+	term_attributes_were_set = 0;
+
+	/* STDIN must be a terminal */
+
+	if (!isatty(STDIN_FILENO)) {
+		return;
+	}
+
 	/* Get and keep the original attributes */
 
 	if (tcgetattr(STDIN_FILENO, &original_term_attributes)) {