[PATCH] update FSF address in COPYING

FSF has moved so update the address as per
http://www.gnu.org/licenses/gpl.txt.

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>