In the even that Linux failed to allocate the reserved memory rangetypo in subject: rtmfs
specified in the DeviceTree, the size of the reserved_mem will be 0,
which results in a oops when memory remapping is attempted.
Detect this and report that the memory region was not found instead.
Signed-off-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
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