change default case to an enum value case, per compression code review

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@42977 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -6615,7 +6615,7 @@ row_format_to_row_type(srv_row_format_t row_format)
     case SRV_ROW_FORMAT_FAST:
         return ROW_TYPE_TOKU_FAST;
 #endif
-    default:
+    case SRV_ROW_FORMAT_DEFAULT:
         return ROW_TYPE_DEFAULT;
     }
 }