Minor code style cleanup. Fix a couple compiler warnings.

--HG--
branch : minor

src/modules/audio/openal/Filter.cpp

@@ -96,6 +96,7 @@ bool Filter::setParams(Type type, const std::vector<float> &params)
 	case TYPE_MAX_ENUM:
 		break;
 	}
+
 	//failed to make filter specific type - not supported etc.
 	if (alGetError() != AL_NO_ERROR)
 	{

src/modules/audio/openal/Filter.h

@@ -29,6 +29,7 @@
 #else
 #include <OpenAL-Soft/alc.h>
 #include <OpenAL-Soft/al.h>
+#include <OpenAL-Soft/alext.h>
 #endif
 #else
 #include <AL/alc.h>

src/modules/audio/wrap_Source.cpp

@@ -347,7 +347,7 @@ int w_Source_setFilter(lua_State *L)
 	else if (lua_gettop(L) > 2)
 	{
 		const char *ftypestr = luaL_checkstring(L, 2);
-		if (ftypestr && !Filter::getConstant(ftypestr, type))
+		if (!Filter::getConstant(ftypestr, type))
 			return luaL_error(L, "Invalid filter type: %s", ftypestr);
 
 		unsigned int count = Filter::getParameterCount(type);
@@ -363,7 +363,7 @@ int w_Source_setFilter(lua_State *L)
 		}
 		lua_rawgeti(L, 2, 1);
 		const char *ftypestr = luaL_checkstring(L, -1);
-		if (ftypestr && !Filter::getConstant(ftypestr, type))
+		if (!Filter::getConstant(ftypestr, type))
 			return luaL_error(L, "Invalid filter type: %s", ftypestr);
 		lua_pop(L, 1);