This patch has the following cleanups to oprofile:

  - Remove spurious casts
  - vfree() accepts NULL pointers so remove redundant test
  - The parameter for __free_cpu_buffer() is not used so merge the function
    with free_cpu_buffer()
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>