drivers/acpi/: Spelling fixes

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index cbfe9ae..d9d531c 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -830,7 +830,7 @@
 	if (ACPI_SUCCESS(status))
 		device->flags.wake_capable = 1;
 
-	/* TBD: Peformance management */
+	/* TBD: Performance management */
 
 	return 0;
 }