[media] mantis: fix error handling

Remove dead code, make goto label names more expressive and add a label
in order to call mantis_dvb_exit if mantis_uart_init fails.

Also make sure that mantis_pci_exit is called if we fail the
mantis_stream_control call and that we call mantis_i2c_exit if
mantis_get_mac fails.

[[email protected]: fix merge conflict]
Signed-off-by: Silvan Jegen <[email protected]>
Reviewed-by: Dan Carpenter <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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