efi_selftest: do not execute test if setup failed

Executing a test after failed setup may lead to unexpected behavior like
an illegal memory access. So after a setup failure we should skip to
teardown.

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

include/efi_selftest.h

@@ -114,6 +114,7 @@ u16 efi_st_get_key(void);
  * @setup:	set up the unit test
  * @teardown:	tear down the unit test
  * @execute:	execute the unit test
+ * @setup_ok:	setup was successful (set at runtime)
  * @on_request:	test is only executed on request
  */
 struct efi_unit_test {
@@ -123,6 +124,7 @@ struct efi_unit_test {
 		     const struct efi_system_table *systable);
 	int (*execute)(void);
 	int (*teardown)(void);
+	int setup_ok;
 	bool on_request;
 };