drm/vmwgfx: Stop using plane->fb in vmw_kms_update_implicit_fb()

The only caller of vmw_kms_update_implicit_fb() is the page_flip
hook which itself gets called with the plane mutex already held.
Hence we can look at plane->state safely.

v2: Drop the bogus lockdep assert

Cc: Deepak Rawat <[email protected]>
Cc: Thomas Hellstrom <[email protected]>
Cc: Sinclair Yeh <[email protected]>
Cc: VMware Graphics <[email protected]>
Cc: Daniel Vetter <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Deepak Rawat <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Sinclair Yeh <[email protected]>

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