libfdt: Add BADPHANDLE error string

The BADPHANDLE error was missing a string, leading to an <unknown error>
string being returned if you were to call fdt_strerror.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
1 file changed