spi: dw: Avoid BUG_ON() in case of host failure
If dws is NULL in dw_spi_host_add(), we return the error to the upper callers instead of crashing. The patch replaces BUG_ON by returning -EINVAL to the caller. Signed-off-by: NAditya Pakki <pakki001@umn.edu> Link: https://lore.kernel.org/r/20191205231421.9333-1-pakki001@umn.eduSigned-off-by: NMark Brown <broonie@kernel.org>
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