[SCSI] fusion: make mptspi_target_destroy() static

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Eric Moore <Eric.Moore@lsi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>