g_keymapLen improvement suggestion

[fefe17]

In meshcore/KVM/Linux/linux_events.c:

19 static const int g_keymapLen = 96; // Modify this when you change anything in g_keymap.

23 static struct keymap_t g_keymap[] = {

This is needlessly error prone. Recommendation: move the declaration of g_keyMapLen down, write it like this:

static const size_t g_keymapLen = sizeof(g_keymap) / sizeof(g_keymap[0]);