fix ia64 local_irq_save() et.al.

psr is not a good name for local variable in macro body when it
has a good chance of being the argument of said macro (actually
is at least in one place)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>