checkpatch: dissallow spaces between stars in pointer types

Disallow spaces within multiple pointer stars (*) in both casts and
definitions.  Both of these would now be reported:

	(char * *)
	char * *foo;

Also now consistently detects and reports the attributes within these
structures making the error report itself clearer.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>