staging: pi433: goto abort when setting failed in tx_thread

tx_thread in pi433 works for transmitting. it reads tx_cfg and data
stored in kfifo put in pi433_write() and transmits. If it exits,
pi433_write() just store its data and no one transmits data. So,
tx_thread should not exit even when it failed for setting registers.
It seems that it's okay to go to abort and continue to loop and wait for
writing.

Signed-off-by: Sidong Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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