crypto/conf: openssl_config_int() returns unitialized value

openssl_config_int() returns the uninitialized variable `ret`
when compiled with OPENSSL_SYS_UEFI.

Fixes #9026
Reviewed-by: NTim Hudson <tjh@openssl.org>
Reviewed-by: NShane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9029)

(cherry picked from commit f4a96507fb880d5f5a707c138388cb8b5b1ba8c8)

crypto/conf/conf_sap.c

@@ -42,7 +42,7 @@ void OPENSSL_config(const char *appname)
 
 int openssl_config_int(const OPENSSL_INIT_SETTINGS *settings)
 {
-    int ret;
+    int ret = 0;
     const char *filename;
     const char *appname;
     unsigned long flags;