Fix: failed to open config file if not specified when using CA commands

Issue was introduced in
a0a82324f9

This patch fixes an issue which causes the 'openssl ca' commands to
fail if '-config' is not specified even if it says so otherwise.
Problem is that the default config is not loaded and the conf variable
is NULL which causes an exception.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

apps/ca.c

@@ -304,11 +304,6 @@ int ca_main(int argc, char **argv)
     X509_REVOKED *r = NULL;
     OPTION_CHOICE o;
 
-    conf = NULL;
-    section = NULL;
-    preserve = 0;
-    msie_hack = 0;
-
     prog = opt_init(argc, argv, ca_options);
     while ((o = opt_next()) != OPT_EOF) {
         switch (o) {
@@ -481,13 +476,11 @@ end_of_options:
     argv = opt_rest();
 
     BIO_printf(bio_err, "Using configuration from %s\n", configfile);
-    /* We already loaded the default config file */
-    if (configfile != default_config_file) {
-        if ((conf = app_load_config(configfile)) == NULL)
-            goto end;
-        if (!app_load_modules(conf))
-            goto end;
-    }
+
+    if ((conf = app_load_config(configfile)) == NULL)
+        goto end;
+    if (!app_load_modules(conf))
+        goto end;
 
     /* Lets get the config section we are using */
     if (section == NULL) {