ACPI: Video: Increase buffer size for writes to brightness proc file.

In order to be able to write the value "100"
to /proc/acpi/video/.../brightness, we have to allocate 5 bytes:
4 characters will be written (1, 0, 0 plus null byte),
and 1 byte should be buffer for a terminating NULL character.

http://bugzilla.kernel.org/show_bug.cgi?id=9278

Signed-off-by: Danny Baumann <dannybaumann@web.de>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/video.c

@@ -897,7 +897,7 @@ acpi_video_device_write_brightness(struct file *file,
 {
 	struct seq_file *m = file->private_data;
 	struct acpi_video_device *dev = m->private;
-	char str[4] = { 0 };
+	char str[5] = { 0 };
 	unsigned int level = 0;
 	int i;