patch d060db63 in mainline.

[SPARC64]: Fix register usage in xor_raid_4().

Some typos led to using %i6/%i7 instead of %l6/%l7 in loads which is
really really bad because those are the frame pointer and return PC.

Based upon a raid5 crash report by Bertrand Joel.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>