From 5e1ba50731ab2ce19fec1eed2ea8386e4c60ee18 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 27 May 2015 08:57:16 -0400
Subject: [PATCH] fix unsigned/signed math error

---
 libs/surfaces/mackie/mcp_buttons.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libs/surfaces/mackie/mcp_buttons.cc b/libs/surfaces/mackie/mcp_buttons.cc
index ee04d681b5..1cb388da48 100644
--- a/libs/surfaces/mackie/mcp_buttons.cc
+++ b/libs/surfaces/mackie/mcp_buttons.cc
@@ -102,8 +102,12 @@ MackieControlProtocol::left_press (Button &)
 
 	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("bank left with current initial = %1 nstrips = %2 tracks/busses = %3\n",
 							   _current_initial_bank, strip_cnt, sorted.size()));
-
+	if (_current_initial_bank > 0) {
 		switch_banks ((_current_initial_bank - 1) / strip_cnt * strip_cnt);
+	} else {
+		switch_banks (0);
+	}
+
 
 	return on;
 }