spi/omap2_mcspi: fix NULL pointer dereference
Check spi->controller_state before dereferencing. Shows up NULL here when using spi_alloc_device()/spi_add_device() and spi_add_device() fails before spi_setup(). Calling spi_dev_put() on the leftover spi_device results in the error. Signed-off-by: NScott Ellis <scott@jumpnowtek.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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