Fix omap sdma handling for missing auxdata for v5.6 merge window
Turns out I was overly optimistic about making platform data optional, and
we still need it to pass various quirk flags. If the platform data is missing
for whatever reason, we will currently try to access non-existing data later
on.
* tag 'omap-for-v5.6/sdma-fix-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
dmaengine: ti: omap-dma: don't allow a null od->plat pointer to be dereferenced
Link: https://lore.kernel.org/r/pull-1579200367-372444@atomide.com
Signed-off-by: Olof Johansson <olof@lixom.net>
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