Fix VFS panic "process has two calls" when closing a socket.

minix/lib/libc/sys/close.c

@@ -12,7 +12,12 @@ close(int fd)
 
 	memset(&m, 0, sizeof(m));
 	m.m_lc_vfs_close.fd = fd;
-	m.m_lc_vfs_close.nblock = 0;
+
+	// When closing a socket VFS would output an error message:
+	// "vfs(1): panic: process has two calls (105, 131)".
+	// The fix is to make close non-blocking by default.
+	// There's probably a better way to do this TODO.
+	m.m_lc_vfs_close.nblock = 1;
 
 	return _syscall(VFS_PROC_NR, VFS_CLOSE, &m);
 }