zwp_virtual-keyboard: fix mmap error handling
If mmap fails, it will return MAP_FAILED not NULL. Since the error
handling was incorrectly checking for NULL, MAP_FAILED was being passed
to xkb_keymap_new_from_string, on mmap failure, causing a segfault.
This just fixes the error checking.
@@ -51,7 +51,7 @@ static void virtual_keyboard_keymap(struct wl_client *client,
goto context_fail;
}
void *data = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (!data) {
+ if (data == MAP_FAILED) {
goto fd_fail;
}
struct xkb_keymap *keymap = xkb_keymap_new_from_string(context, data,
