ACPI: buffer array too short in drivers/acpi/system.c

Since "ff_gbl_lock" has a length of 11 chars and is copied with sprintf
to char buffer[10], there is a problem. We need char buffer[12] because
of the closing zero byte.
Signed-off-by: NJohann Felix Soden <johfel@users.sourceforge.net>
Signed-off-by: NLen Brown <len.brown@intel.com>

drivers/acpi/system.c

@@ -319,7 +319,7 @@ void acpi_irq_stats_init(void)
 		goto fail;
 
 	for (i = 0; i < num_counters; ++i) {
-		char buffer[10];
+		char buffer[12];
 		char *name;
 
 		if (i < num_gpes)