* new helper - ptr_to_compat(); inverse to compat_ptr(), with proper
   typechecking.  A lot of open-coded equivalents replaced with using
   that one.
 * a couple of severely misguiding places got back to sanity - we had
   basically
	put_user((long)p, &foo->compat_uptr_t_field);

That will, of course, cast (long)p further - to u32, but that fact is
carefully obfuscated...  Sanitized by replacing (long)p in such places
with ptr_to_compat(p); fortunately, there hadn't been many of those...
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>