free preset memory

main.go

@@ -6,6 +6,7 @@ import "github.com/veandco/go-sdl2/sdl"
 #cgo CFLAGS: -I/home/nick/Downloads/include
 #cgo LDFLAGS: -L/home/nick/.local/lib -lprojectM-4
 #include "projectM-4/projectM.h"
+#include <stdlib.h>
 */
 import "C"
 
@@ -14,6 +15,7 @@ import (
 	"io"
 	"os"
 	"time"
+	"unsafe"
 )
 
 func main() {
@@ -47,9 +49,10 @@ func main() {
 	C.projectm_set_window_size(handle, C.ulong(windowWidth), C.ulong(windowHeight))
 
 	preset := C.CString("/usr/share/projectM/presets/presets_stock/Zylot - Wisps.milk")
+	defer C.free(unsafe.Pointer(preset))
 	C.projectm_load_preset_file(handle, preset, false)
 
-	const bufSize int = 2048
+	const bufSize uint = 2048
 
 	running := true
 	for running {