fsyscall-support & erratum #s

Several people pointed out that I got the McKinley Erratum number wrong. I called it E7, when it really is E9. I updated the code accordingly (not that it makes any functional difference...).

	--david

PS: It's perfectly OK to point out my mistakes in public (by cc'ing
the linux-ia64 list). That way, I don't have to respond to the same issue multiple times... ;-)