include/acpi/: Spelling fixes

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 76411b1..6e253b5 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -182,7 +182,7 @@
 /* Limit Interface */
 
 struct acpi_processor_lx {
-	int px;			/* performace state */
+	int px;			/* performance state */
 	int tx;			/* throttle level */
 };