dma-fence: Avoid list_del during fence->cb_list iteration

Before we notify the fence signal callback, we remove the cb from the
list. However, since we are processing the entire list from underneath
the spinlock, we do not need to individual delete each element, but can
simply reset the link and the entire list.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Christian König <[email protected]>
Reviewed-by: Christian König <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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