efi_selftest: correctly check return values

When cancelling the timer we should check the return
value provided by the set_timer service.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

lib/efi_selftest/efi_selftest_events.c

@@ -186,7 +186,7 @@ static int execute(void)
 		return EFI_ST_FAILURE;
 	}
 	ret = boottime->set_timer(event_wait, EFI_TIMER_STOP, 0);
-	if (index != 0) {
+	if (ret != EFI_SUCCESS) {
 		efi_st_error("Could not cancel timer\n");
 		return EFI_ST_FAILURE;
 	}

lib/efi_selftest/efi_selftest_tpl.c

@@ -207,7 +207,7 @@ static int execute(void)
 		return EFI_ST_FAILURE;
 	}
 	ret = boottime->set_timer(event_wait, EFI_TIMER_STOP, 0);
-	if (index != 0) {
+	if (ret != EFI_SUCCESS) {
 		efi_st_error("Could not cancel timer\n");
 		return EFI_ST_FAILURE;
 	}