drivers/intel/fsp2_0: Check return type against CB_SUCCESS

commit 6af980a2a
(drivers/intel/fsp2_0: Allow `mp_startup_all_cpus()` to run serially)
drops CB_SUCCESS check for mp_run_on_all_aps function hence, this
changes bring back the required return type against CB_SUCCESS.

Change-Id: I9fc81e6a7eebbf0072ea2acb36b3c33539b517a7
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58757
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/drivers/intel/fsp2_0/ppi/mp_service_ppi.c b/src/drivers/intel/fsp2_0/ppi/mp_service_ppi.c
index 5b537a9..9aef1b6 100644
--- a/src/drivers/intel/fsp2_0/ppi/mp_service_ppi.c
+++ b/src/drivers/intel/fsp2_0/ppi/mp_service_ppi.c
@@ -108,7 +108,8 @@
 	 * due to lack of acquiring a spin lock while accessing common data structure in
 	 * multiprocessor environment.
 	 */
-	if (mp_run_on_all_aps((void *)procedure, argument, timeout_usec, false)) {
+	if (mp_run_on_all_aps((void *)procedure, argument, timeout_usec, false) !=
+				CB_SUCCESS) {
 		printk(BIOS_DEBUG, "%s: Exit with Failure\n", __func__);
 		return FSP_NOT_STARTED;
 	}