Bug 622903 - fix coverity Defect Type: Code maintainability issues

https://bugzilla.redhat.com/show_bug.cgi?id=622903

Comment:
Pointer "slapdFrontendConfig" returned by "init_config" is never
used (line 244).

ldap/servers/slapd/tools/pwenc.c

@@ -241,7 +241,7 @@ main( argc, argv )
     }
 
 	if (!slapdFrontendConfig) {
-		if (!(slapdFrontendConfig = init_config(NULL))) {
+		if (!init_config(NULL)) {
 			usage( name );
 			return(1);
 		}