Fix a typo in ioctl usage message.

Change-Id: I850dd9995a8ad6cb1f606cca2f57d7dbba2f40ed
diff --git a/toolbox/ioctl.c b/toolbox/ioctl.c
index 17fabff..ab1efa8 100644
--- a/toolbox/ioctl.c
+++ b/toolbox/ioctl.c
@@ -45,7 +45,7 @@
             break;
         case 'h':
             fprintf(stderr, "%s [-l <length>] [-a <argsize>] [-rdh] <device> <ioctlnr>\n"
-                    "  -l <lenght>   Length of io buffer\n"
+                    "  -l <length>   Length of io buffer\n"
                     "  -a <argsize>  Size of each argument (1-8)\n"
                     "  -r            Open device in read only mode\n"
                     "  -d            Direct argument (no iobuffer)\n"