tvheadend: fix crash on imx6

[  938.353431] Alignment trap: not handling instruction edd10b00 at [<00052748>]
[  938.353450] Unhandled fault: alignment exception (0x011) at 0x6d40ab76
[  945.194073] Alignment trap: not handling instruction edd10b00 at [<00052748>]
[  945.194096] Unhandled fault: alignment exception (0x011) at 0x018796be
....