Make two icu fuzz targets more useful.

fuzzers/icu_break_iterator_fuzzer.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 
 #include <stddef.h>
 #include <stdint.h>
 #include <memory>
 #include "third_party/icu/fuzzers/fuzzer_utils.h"
 #include "third_party/icu/source/common/unicode/brkiter.h"
 
 IcuEnvironment* env = new IcuEnvironment();
 
@@ skipping 17 matching lines @@
     case 2:
       bi.reset(icu::BreakIterator::createCharacterInstance(locale, status));
       break;
     case 3:
       bi.reset(icu::BreakIterator::createSentenceInstance(locale, status));
       break;
     case 4:
       bi.reset(icu::BreakIterator::createTitleInstance(locale, status));
       break;
   }
-  if (U_FAILURE(status)) return 0;
+  if (U_FAILURE(status))
+    return 0;
+  bi->setText(str);
 
   for (int32_t p = bi->first(); p != icu::BreakIterator::DONE; p = bi->next())
-    if (U_FAILURE(status)) return 0;
+    if (U_FAILURE(status))
+      return 0;
 
   return 0;
 }