UBI: rename si to ai

After re-naming the 'struct ubi_scan_info' we should adjust all variables
named 'si' to something else, because 'si' stands for "scanning info".
Let's rename it to 'ai' which stands for "attaching info" which is
a bit more consistent and has the same length, which makes re-naming easy.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index e73b1fe..84362a8 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -176,7 +176,7 @@
  */
 void ubi_dump_sv(const struct ubi_ainf_volume *sv)
 {
-	printk(KERN_DEBUG "Volume scanning information dump:\n");
+	printk(KERN_DEBUG "Volume attaching information dump:\n");
 	printk(KERN_DEBUG "\tvol_id         %d\n", sv->vol_id);
 	printk(KERN_DEBUG "\thighest_lnum   %d\n", sv->highest_lnum);
 	printk(KERN_DEBUG "\tleb_count      %d\n", sv->leb_count);
@@ -194,7 +194,7 @@
  */
 void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type)
 {
-	printk(KERN_DEBUG "eraseblock scanning information dump:\n");
+	printk(KERN_DEBUG "eraseblock attaching information dump:\n");
 	printk(KERN_DEBUG "\tec       %d\n", aeb->ec);
 	printk(KERN_DEBUG "\tpnum     %d\n", aeb->pnum);
 	if (type == 0) {