uart_dev_snps: Fix device probing
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Authored by kd on Oct 5 2022, 6:57 AM.

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manu

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rG6bdc398832a6: uart_dev_snps: Fix device probing

Summary

The "uart_bus_probe" function is used as a generic part of uart probe logic.
It returns a driver priority(negative number) if successful and an error code otherwise.
Fix the error checking condition to account for that.
Also, while here return "BUS_PROBE_VENDOR", instead of "0".

PR: 266657