media: dvb: Add check on sp8870_readreg
In sp8870_set_frontend_parameters, the function sp8870_readreg may return an error when i2c_transfer fails. The fix checks for this error and returns upstream consistent with other invocations. Signed-off-by: NAditya Pakki <pakki001@umn.edu> Signed-off-by: NSean Young <sean@mess.org> Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>
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