microblaze: warn if of_iomap() failed
of_iomap() can return NULL. The function is void thus error propagation is not possible but at least a WARN_ON() seems warranted here as a silent failure might lead to a hard to understand system state. Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org> Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
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