Wire up net_stack_cleanup()

The NetStack.h header is currently not usable from C code. So while
net_stack_init() is called from platform code, we cannot call
net_stack_cleanup() from OpenFirmware's platform_start_kernel().
Thus call it directly from main()'s cleanup TODO, having assured
that the function is a no-op when no network stack was initialized.

Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>

src/system/boot/loader/main.cpp

@@ -14,6 +14,7 @@
 #include <boot/heap.h>
 #include <boot/PathBlacklist.h>
 #include <boot/stdio.h>
+#include <boot/net/NetStack.h>
 
 #include "file_systems/packagefs/packagefs.h"
 
@@ -145,6 +146,7 @@ main(stage2_args *args)
 			gKernelArgs.boot_volume = buffer;
 			gKernelArgs.boot_volume_size = gBootVolume.ContentSize();
 
+			net_stack_cleanup();
 			// ToDo: cleanup, heap_release() etc.
 			heap_print_statistics();
 			platform_start_kernel();