drm: Allow range of 0 for drm_mm_insert_node_in_range()
We gracefully handle the caller specifying a zero range, so don't force them to special case that condition if it naturally falls out of their setup. What we don't check is if the end < start, so keep that as an assert for an illegal call. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190626094330.3556-1-chris@chris-wilson.co.uk
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