r22808: store default buffer size for samr operations in libnet context.

This allows not requiring it as an argument in some function calls
and still enables specifying any size if it's necessary via libnet
context.

rafal

source/libnet/libnet.c

@@ -47,7 +47,10 @@ struct libnet_context *libnet_context_init(struct event_context *ev)
 
 	/* connected services' params */
 	ZERO_STRUCT(ctx->samr);
-	ZERO_STRUCT(ctx->lsa);
+	ZERO_STRUCT(ctx->lsa);	
+
+	/* default buffer size for various operations requiring specifying a buffer */
+	ctx->samr.buf_size = 128;
 
 	return ctx;
 }