conf/conf_sap.c: correct return of ossl_config_int() in UEFI system

FIX: #21299

ret in ossl_config_int() only used to check return value of
CONF_modules_load_file(), should set it to 1 if in UEFI system.

Signed-off-by: Yi Li <yi1.li@intel.com>

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #21300)

crypto/conf/conf_sap.c

@@ -66,6 +66,8 @@ int ossl_config_int(const OPENSSL_INIT_SETTINGS *settings)
 
 #ifndef OPENSSL_SYS_UEFI
     ret = CONF_modules_load_file(filename, appname, flags);
+#else
+    ret = 1;
 #endif
     openssl_configured = 1;
     return ret;