lkl tools: lklfuse: add read-only option in help

Signed-off-by: Quentin Anglade <[email protected]>

tools/lkl/lklfuse.c

@@ -65,6 +65,7 @@ static void usage(void)
 " -o type=fstype filesystem type\n"
 " -o mb=memory in mb ammount of memory to allocate\n"
 " -o part=parition partition to mount\n"
+" -o ro open file read-only\n"
 " -o opts=options mount options (use \\ to escape , and =)\n"
 );
 }