drm/buddy: Modify duplicate list_splice_tail call

Remove the duplicate list_splice_tail call when the
total_allocated < size condition is true.

Cc: <stable@vger.kernel.org> # 6.7+
Fixes: 8746c6c9

 ("drm/buddy: Fix alloc_range() error handling code")
Reported-by: Bert Karwatzki <spasswolf@web.de>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240216100048.4101-1-Arunpravin.PaneerSelvam@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>