Let rtlsdr_set_tuner_if_gain return -1 upon error. #21
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Let rtlsdr_set_tuner_if_gain() return -1 when it cannot be set.
That was the case when there is no device, no tuner or when the
value was invalid, but it returned 0 when the there was no way
to set if-gain for the used receiver.
Now it returns also -1 when there is no set-function for if_gain.
Without this patch, a user interface is not aware that the
specified if_gain has not been set when using a tuner without
a set_if_gain() function.