ACPI: Fix typos

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index ba1bd26..3a73a93 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -447,8 +447,8 @@
 	if (!try_module_get(calling_module))
 		return -EINVAL;
 
-	/* is_done is set to negative if an error occured,
-	 * and to postitive if _no_ error occured, but SMM
+	/* is_done is set to negative if an error occurred,
+	 * and to postitive if _no_ error occurred, but SMM
 	 * was already notified. This avoids double notification
 	 * which might lead to unexpected results...
 	 */