i2o: Fix I/O space allocation copy/paste error

When i2o_iop_systab_set() allocates I/O port space, it assigns the base of
the new I/O port region to sb->current_mem_base, not sb->current_io_base.
This looks like a copy/paste error, because we do use current_io_base, but
there's no other place that sets it.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/message/i2o/iop.c b/drivers/message/i2o/iop.c
index a8c08f3..a8373d7 100644
--- a/drivers/message/i2o/iop.c
+++ b/drivers/message/i2o/iop.c
@@ -704,7 +704,7 @@
 					      NULL, NULL) >= 0) {
 			c->io_alloc = 1;
 			sb->current_io_size = resource_size(res);
-			sb->current_mem_base = res->start;
+			sb->current_io_base = res->start;
 			osm_info("%s: allocated %llu bytes of PCI I/O at "
 				"0x%016llX.\n", c->name,
 				(unsigned long long)resource_size(res),