quoted

test is really a no-op.  But it's still off by one and upsets the
static checkers so we may as well correct it.

'idx' should be 0~63, because cea_modes array is defined as
'cea_modes[64]'.

According to CEA/EIA-861E, there are 64 defined modes, but idx is valid for 1-64, 0 is reserved hence the check for 

        If (!idx || idx > 63) {

Think idx check really should be !idx || idx > 64 if following CEA/EIA-861E

CEA/EIA-861F add additional entries and idx is valid from 1-107

David
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