checkpatch: allow for type modifiers on multiple declarations

Allow for type modifiers mid declaration on multiple declarations:

	struct mxser_mstatus ms, __user *msu = argp;

Reported by Jiri Slaby.

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>