tree wide: use kvfree() than conditional kfree()/vfree()

tree wide: use kvfree() than conditional kfree()/vfree()

There are many locations that do

  if (memory_was_allocated_by_vmalloc)
    vfree(ptr);
  else
    kfree(ptr);

but kvfree() can handle both kmalloc()ed memory and vmalloc()ed memory
using is_vmalloc_addr().  Unless callers have special reasons, we can
replace this branch with kvfree().  Please check and reply if you found
problems.

Signed-off-by: Tetsuo Handa <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Acked-by: Jan Kara <[email protected]>
Acked-by: Russell King <[email protected]>
Reviewed-by: Andreas Dilger <[email protected]>
Acked-by: "Rafael J. Wysocki" <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: "Luck, Tony" <[email protected]>
Cc: Oleg Drokin <[email protected]>
Cc: Boris Petkov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>