Coverity fix: uninitialized scalar member.

git-svn-id: http://sfntly.googlecode.com/svn/trunk/cpp/src@119 672e30a5-4c29-85ac-ac6d-611c735e0a51
diff --git a/sfntly/table/bitmap/index_sub_table.cc b/sfntly/table/bitmap/index_sub_table.cc
index d302aed..5e29784 100644
--- a/sfntly/table/bitmap/index_sub_table.cc
+++ b/sfntly/table/bitmap/index_sub_table.cc
@@ -210,7 +210,12 @@
 }
 
 IndexSubTable::Builder::Builder(int32_t data_size, int32_t index_format)
-    : SubTable::Builder(data_size), index_format_(index_format) {
+    : SubTable::Builder(data_size),
+      first_glyph_index_(0),
+      last_glyph_index_(0),
+      index_format_(index_format),
+      image_format_(0),
+      image_data_offset_(0) {
 }
 
 IndexSubTable::Builder::Builder(int32_t index_format,
@@ -218,6 +223,8 @@
                                 int32_t image_data_offset,
                                 int32_t data_size)
     : SubTable::Builder(data_size),
+      first_glyph_index_(0),
+      last_glyph_index_(0),
       index_format_(index_format),
       image_format_(image_format),
       image_data_offset_(image_data_offset) {