[media] zd1301: fix building interface driver without demodulator
If the USB driver is enabled but the demodulator is not, we get a link error: ERROR: "zd1301_demod_get_dvb_frontend" [drivers/media/usb/dvb-usb-v2/zd1301.ko] undefined! ERROR: "zd1301_demod_get_i2c_adapter" [drivers/media/usb/dvb-usb-v2/zd1301.ko] undefined! Such a configuration obviously makes no sense, but we should not fail the build. This tries to mimic what we have for other drivers by turning the build failure into a runtime failure. Alternatively we could use an unconditional 'select' or 'depends on' to enforce a sane configuration. Fixes: 47d65372 ("[media] zd1301_demod: ZyDAS ZD1301 DVB-T demodulator driver") Fixes: 992b3987 ("[media] zd1301: ZyDAS ZD1301 DVB USB interface driver") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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