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>

drivers/misc/thinkpad_acpi.c

@@ -459,7 +459,7 @@ static char *next_cmd(char **cmds)
  ****************************************************************************/
 
 /*************************************************************************
- * ibm-acpi init subdriver
+ * thinkpad-acpi init subdriver
  */
 
 static int thinkpad_acpi_driver_init(void)