efi_selftest: fix typos

fix typos
correct the header comment of efi_selftest_variables.c

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/lib/efi_selftest/efi_selftest_events.c b/lib/efi_selftest/efi_selftest_events.c
index 47f9f99..ed99a53 100644
--- a/lib/efi_selftest/efi_selftest_events.c
+++ b/lib/efi_selftest/efi_selftest_events.c
@@ -17,7 +17,7 @@
 static struct efi_boot_services *boottime;
 
 /*
- * Notification function, increments the notfication count if parameter
+ * Notification function, increments the notification count if parameter
  * context is provided.
  *
  * @event	notified event