dvbv5-zap LNA related bug

frontend c->frequency will not be set when LNA option is used.

[crope@localhost dvb]$ ./dvbv5-zap -c dvb_all_channel.conf MTV3 --monitor --lna=1 using demux '/dev/dvb/adapter0/demux0'
reading channels from file 'dvb_all_channel.conf'
service has pid type 05: 6101
tuning to 714000000 Hz
ERROR FE_SET_PROPERTY: Invalid argument
ERROR: dvb_fe_set_parms failed (Invalid argument)
[crope@localhost dvb]$ ./dvbv5-zap -c dvb_all_channel.conf MTV3 --monitor --lna=0 using demux '/dev/dvb/adapter0/demux0'
reading channels from file 'dvb_all_channel.conf'
service has pid type 05: 6101
tuning to 714000000 Hz
ERROR FE_SET_PROPERTY: Invalid argument
ERROR: dvb_fe_set_parms failed (Invalid argument)
[crope@localhost dvb]$ ./dvbv5-zap -c dvb_all_channel.conf MTV3 --monitor --lna=-1 using demux '/dev/dvb/adapter0/demux0'
reading channels from file 'dvb_all_channel.conf'
service has pid type 05: 6101
tuning to 714000000 Hz

       (0x00)

Lock (0x1f)
dvb_set_pesfilter to 0x2000
^C[crope@localhost dvb]# now it workd
[crope@localhost dvb]$ # now it works
[crope@localhost dvb]$ ./dvbv5-zap -c dvb_all_channel.conf MTV3 --monitor --lna=1 using demux '/dev/dvb/adapter0/demux0'
reading channels from file 'dvb_all_channel.conf'
service has pid type 05: 6101
tuning to 714000000 Hz

       (0x00)

Lock (0x1f)
dvb_set_pesfilter to 0x2000
^C[crope@localhost dvb]$

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