Fix a couple of typos

Change-Id: Ibec40c3cd8e14343b096e406ba233cf4f131e7b9
diff --git a/av1/common/blockd.h b/av1/common/blockd.h
index 9b800a4..29dcd50 100644
--- a/av1/common/blockd.h
+++ b/av1/common/blockd.h
@@ -62,8 +62,8 @@
 #define MAX_SEG_MASK_BITS 1
 // SEG_MASK_TYPES should not surpass 1 << MAX_SEG_MASK_BITS
 typedef enum {
-  DIFFWTD_45 = 0,
-  DIFFWTD_45_INV,
+  DIFFWTD_42 = 0,
+  DIFFWTD_42_INV,
   SEG_MASK_TYPES,
 } SEG_MASK_TYPE;