fix "warning: this decimal constant is unsigned only in ISO C90"

diff --git a/libs/ardour/luabindings.cc b/libs/ardour/luabindings.cc
index 8130d0caeb01beb027e07c00742fe558aef6ba20..2d8b29aa0311f330381a19ee7fafaad77c9189f7 100644 (file)
--- a/libs/ardour/luabindings.cc
+++ b/libs/ardour/luabindings.cc
@@ -380,7 +380,7 @@ LuaBindings::common (lua_State* L)
                .addVoidConstructor ()
                .addFunction ("get", static_cast<uint32_t(ChanMapping::*)(DataType, uint32_t) const>(&ChanMapping::get))
                .addFunction ("set", &ChanMapping::set)
-               .addConst ("Invalid", 4294967295) // UINT32_MAX
+               .addConst ("Invalid", 4294967295U) // UINT32_MAX
                .endClass ()
 
                .beginNamespace ("Properties")