sgi-xp: replace AMO_t typedef by struct amo

Replace the AMO_t typedef by a direct reference to 'struct amo'.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/misc/sgi-xp/xp_sn2.c b/drivers/misc/sgi-xp/xp_sn2.c
index 3d553fa..1fcfdeb 100644
--- a/drivers/misc/sgi-xp/xp_sn2.c
+++ b/drivers/misc/sgi-xp/xp_sn2.c
@@ -32,7 +32,7 @@
  * If the PIO read times out, the MCA handler will consume the error and
  * return to a kernel-provided instruction to indicate an error. This PIO read
  * exists because it is guaranteed to timeout if the destination is down
- * (AMO operations do not timeout on at least some CPUs on Shubs <= v1.2,
+ * (amo operations do not timeout on at least some CPUs on Shubs <= v1.2,
  * which unfortunately we have to work around).
  */
 static enum xp_retval