nano: src: Don't set userdata to NULL

* The struct default to NULL

Change-Id: Ic1f680f9bfdb63909f91c632d63c3d7563956fea
diff --git a/src/files.c b/src/files.c
index ebcf22f..d082394 100644
--- a/src/files.c
+++ b/src/files.c
@@ -2453,8 +2453,6 @@
 	    } while (userdata != NULL &&
 			strcmp(userdata->pw_name, tilde_dir + 1) != 0);
 	    endpwent();
-#else
-	    userdata = NULL;
 #endif
 
 	    if (userdata != NULL)