Support for "control" nodes was removed from the drm subsystem some time

ago, but some code in drmopen() remained which means that opening a drm
device node with a minor that matches the range for the "control" nodes
will hit a kernel assertion.  A similar issue exists for "render" nodes
corresponding to a driver that only supports KMS (such as rkdrm(4)).

Add checks to see if the minor is valid and return ENXIO if that isn't the
case to prevent a kernel crash.

ok jsg@, miod@

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