[media] firewire: firedtv-avc: fix more potential buffer overflow

"program_info_length" is user controlled and can go up to 4095.  The
operand[] array has 509 bytes so we need to add a limit here to prevent
buffer overflows.

The " - 4" in the limit check is because we have 4 bytes more data to
add after the memcpy().

[[email protected]: as I merged the version 1 of the patch, I needed
 to rebase to apply just the differences between v1 and v2]
Signed-off-by: Dan Carpenter <[email protected]>

Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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