digital: packet_header_default now comes with an 8-Bit CRC
digital: Fixed *_ofdm.grc examples (Issue #593)
Fixing CID 1043300. Trivial UNINIT fix.

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Fixing CID 1043296: Trivial UNINIT.

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Merge remote-tracking branch 'martin/crc-and-rxofdm'
Merge branch 'maint'