UBI: trivial: fix comment of ubi_calculate_reserved function

The function name within the comment was not aligned with the actual
function name.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
diff --git a/drivers/mtd/ubi/misc.c b/drivers/mtd/ubi/misc.c
index f6a7d7a..b57134d 100644
--- a/drivers/mtd/ubi/misc.c
+++ b/drivers/mtd/ubi/misc.c
@@ -92,7 +92,7 @@
 }
 
 /**
- * ubi_calculate_rsvd_pool - calculate how many PEBs must be reserved for bad
+ * ubi_calculate_reserved - calculate how many PEBs must be reserved for bad
  * eraseblock handling.
  * @ubi: UBI device description object
  */