Initialize fragment_ and verbose_ fields in hiddenapi.cc

Bug: 179354495
Test: m out/soong/hiddenapi-stub-flags.csv
      - make sure that no errors or warnings about missing information
        are output when building fragments.
Merged-In: I9628dad3325c4626bdf997fac25b70898e6177b5
Change-Id: I9628dad3325c4626bdf997fac25b70898e6177b5
(cherry picked from commit 2d97dc11b72543ed2fbb7a03b063b8fd1b06fd3a)
diff --git a/tools/hiddenapi/hiddenapi.cc b/tools/hiddenapi/hiddenapi.cc
index c196660..7954fa4 100644
--- a/tools/hiddenapi/hiddenapi.cc
+++ b/tools/hiddenapi/hiddenapi.cc
@@ -1195,10 +1195,10 @@
   // Whether the input is only a fragment of the whole bootclasspath and may
   // not include a complete set of classes. That requires the tool to ignore missing
   // classes and members.
-  bool fragment_;
+  bool fragment_ = false;
 
   // Whether to output all warnings, even when `fragment_` is set.
-  bool verbose_;
+  bool verbose_ = false;
 };
 
 }  // namespace hiddenapi