ACPI: thinkpad-acpi: rename one stray use of ibm-acpi in a comment

Rename a stray use of ibm-acpi on a comment, no functional changes.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index cac73e5..4b43486 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -459,7 +459,7 @@
  ****************************************************************************/
 
 /*************************************************************************
- * ibm-acpi init subdriver
+ * thinkpad-acpi init subdriver
  */
 
 static int thinkpad_acpi_driver_init(void)