Move the fallback and block incompatible checks
above, so that we dont unnecessarily split the blocks
and leaving the unmerged. This resolves the unnecessary
warn on's thrown during force_merge call.

v2:(Matthew)
  - Move the fallback and block incompatible checks above
    the contains check.
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Fixes: 96950929 ("drm/buddy: Implement tracking clear page feature")
Link: https://patchwork.kernel.org/project/dri-devel/patch/20240517135015.17565-1-Arunpravin.PaneerSelvam@amd.com/Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517143305.17894-1-Arunpravin.PaneerSelvam@amd.com