Add debug target, remove cast, note possible bug.
diff --git a/apps/s_server.c b/apps/s_server.c
index 986c122..40d00cc 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -1470,7 +1470,7 @@
 	DH *ret=NULL;
 	BIO *bio;
 
-	if ((bio=BIO_new_file((char *)dhfile,"r")) == NULL)
+	if ((bio=BIO_new_file(dhfile,"r")) == NULL)
 		goto err;
 	ret=PEM_read_bio_DHparams(bio,NULL,NULL,NULL);
 err: